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66485268480 = 212353167521
BaseRepresentation
bin111101111010110101…
…001011000000000000
320100121110202120122010
4331322311023000000
52042130212042410
650313134012520
74542365312661
oct757265130000
9210543676563
1066485268480
1126218223284
1210a75947140
136367220967
143309d01368
151ae1c93c20
hexf7ad4b000

66485268480 has 416 divisors, whose sum is σ = 223294261248. Its totient is φ = 16868966400.

The previous prime is 66485268467. The next prime is 66485268517. The reversal of 66485268480 is 8486258466.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66485268480.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127610620 + ... + 127611140.

Almost surely, 266485268480 is an apocalyptic number.

66485268480 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 66485268480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111647130624).

66485268480 is an abundant number, since it is smaller than the sum of its proper divisors (156808992768).

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

66485268480 is a wasteful number, since it uses less digits than its factorization.

66485268480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 57.

The spelling of 66485268480 in words is "sixty-six billion, four hundred eighty-five million, two hundred sixty-eight thousand, four hundred eighty".