1156537885797 has 64 divisors (see below), whose sum is σ = 2123914867200. Its totient is φ = 606832680960.

The previous prime is 1156537885759. The next prime is 1156537885819. The reversal of 1156537885797 is 7975887356511.

It is a happy number.

1156537885797 is a `hidden beast` number, since 1 + 1 + 5 + 6 + 537 + 8 + 85 + 7 + 9 + 7 = 666.

It is not a de Polignac number, because 1156537885797 - 2¹⁶ = 1156537820261 is a prime.

It is a super-2 number, since 2×1156537885797² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156537885697) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4257972 + ... + 4521437.

It is an arithmetic number, because the mean of its divisors is an integer number (33186169800).

Almost surely, 2^{1156537885797} is an apocalyptic number.

1156537885797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1156537885797 is a deficient number, since it is larger than the sum of its proper divisors (967376981403).

1156537885797 is a wasteful number, since it uses less digits than its factorization.

1156537885797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8779483 (or 8779477 counting only the distinct ones).

The product of its digits is 444528000, while the sum is 72.

The spelling of 1156537885797 in words is "one trillion, one hundred fifty-six billion, five hundred thirty-seven million, eight hundred eighty-five thousand, seven hundred ninety-seven".