165838600123812 has 144 divisors (see below), whose sum is σ = 540104899384960. Its totient is φ = 43074961047360.

The previous prime is 165838600123811. The next prime is 165838600123817. The reversal of 165838600123812 is 218321006838561.

165838600123812 is a `hidden beast` number, since 1 + 6 + 5 + 8 + 3 + 8 + 600 + 1 + 23 + 8 + 1 + 2 = 666.

It is a super-2 number, since 2×165838600123812² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (165838600123811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 906368143 + ... + 906551094.

Almost surely, 2^{165838600123812} is an apocalyptic number.

165838600123812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165838600123812 is an abundant number, since it is smaller than the sum of its proper divisors (374266299261148).

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

165838600123812 is a wasteful number, since it uses less digits than its factorization.

165838600123812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812919279 (or 1812919260 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 165838600123812 in words is "one hundred sixty-five trillion, eight hundred thirty-eight billion, six hundred million, one hundred twenty-three thousand, eight hundred twelve".