19897157999232 has 192 divisors, whose sum is σ = 57631461249960. Its totient is φ = 6588969615360.

The previous prime is 19897157999207. The next prime is 19897157999261. The reversal of 19897157999232 is 23299975179891.

19897157999232 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 7 + 1 + 579 + 9 + 9 + 2 + 32 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19859001846336 + 38156152896 = 4456344^2 + 195336^2 .

It is a tau number, because it is divible by the number of its divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 263232228 + ... + 263307804.

Almost surely, 2^{19897157999232} is an apocalyptic number.

19897157999232 is a gapful number since it is divisible by the number (12) 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 19897157999232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28815730624980).

19897157999232 is an abundant number, since it is smaller than the sum of its proper divisors (37734303250728).

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

19897157999232 is a wasteful number, since it uses less digits than its factorization.

19897157999232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77091 (or 77076 counting only the distinct ones).

The product of its digits is 1388832480, while the sum is 81.

The spelling of 19897157999232 in words is "nineteen trillion, eight hundred ninety-seven billion, one hundred fifty-seven million, nine hundred ninety-nine thousand, two hundred thirty-two".