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199801205520 = 243578313710459
BaseRepresentation
bin1011101000010100010…
…1000111001100010000
3201002201111012212201220
42322011011013030100
511233143102034040
6231442025125040
720302155140160
oct2720505071420
9632644185656
10199801205520
117780a631a44
1232881029780
1315ac20977c7
1499559345a0
1552e5ca72d0
hex2e85147310

199801205520 has 320 divisors, whose sum is σ = 721693808640. Its totient is φ = 44785004544.

The previous prime is 199801205477. The next prime is 199801205579. The reversal of 199801205520 is 25502108991.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19098051 + ... + 19108509.

It is an arithmetic number, because the mean of its divisors is an integer number (2255293152).

Almost surely, 2199801205520 is an apocalyptic number.

199801205520 is a gapful number since it is divisible by the number (10) 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 199801205520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360846904320).

199801205520 is an abundant number, since it is smaller than the sum of its proper divisors (521892603120).

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

199801205520 is a wasteful number, since it uses less digits than its factorization.

199801205520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10702 (or 10696 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The spelling of 199801205520 in words is "one hundred ninety-nine billion, eight hundred one million, two hundred five thousand, five hundred twenty".