15563897791272 has 96 divisors (see below), whose sum is σ = 43714524934080. Its totient is φ = 5187834397440.

The previous prime is 15563897791259. The next prime is 15563897791283. The reversal of 15563897791272 is 27219779836551.

It is a happy number.

15563897791272 is a `hidden beast` number, since 1 + 5 + 56 + 389 + 7 + 79 + 127 + 2 = 666.

It is a super-2 number, since 2×15563897791272² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 15563897791272.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104106208 + ... + 104255600.

It is an arithmetic number, because the mean of its divisors is an integer number (455359634730).

Almost surely, 2^{15563897791272} is an apocalyptic number.

15563897791272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15563897791272 is an abundant number, since it is smaller than the sum of its proper divisors (28150627142808).

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

15563897791272 is a wasteful number, since it uses less digits than its factorization.

15563897791272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203005 (or 202989 counting only the distinct ones).

The product of its digits is 400075200, while the sum is 72.

The spelling of 15563897791272 in words is "fifteen trillion, five hundred sixty-three billion, eight hundred ninety-seven million, seven hundred ninety-one thousand, two hundred seventy-two".