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66530513400 = 233521347917807
BaseRepresentation
bin111101111101100001…
…110001000111111000
320100201121220020222220
4331331201301013320
52042223302412100
650321431444040
74543455014241
oct757541610770
9210647806886
1066530513400
112624081647a
1210a88b26620
1363737028c0
143311d1bcc8
151ae5c2eaa0
hexf7d8711f8

66530513400 has 192 divisors, whose sum is σ = 222585753600. Its totient is φ = 16341634560.

The previous prime is 66530513381. The next prime is 66530513419. The reversal of 66530513400 is 431503566.

It is an interprime number because it is at equal distance from previous prime (66530513381) and next prime (66530513419).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3727297 + ... + 3745103.

It is an arithmetic number, because the mean of its divisors is an integer number (1159300800).

Almost surely, 266530513400 is an apocalyptic number.

66530513400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66530513400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111292876800).

66530513400 is an abundant number, since it is smaller than the sum of its proper divisors (156055240200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66530513400 is a wasteful number, since it uses less digits than its factorization.

66530513400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18318 (or 18309 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The spelling of 66530513400 in words is "sixty-six billion, five hundred thirty million, five hundred thirteen thousand, four hundred".