166134640656 has 40 divisors (see below), whose sum is σ = 429212027680. Its totient is φ = 55374230016.

The previous prime is 166134640649. The next prime is 166134640699. The reversal of 166134640656 is 656046431661.

It is a super-2 number, since 2×166134640656² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592296 + ... + 826488.

It is an arithmetic number, because the mean of its divisors is an integer number (10730300692).

Almost surely, 2^166134640656 is an apocalyptic number.

166134640656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166134640656 is an abundant number, since it is smaller than the sum of its proper divisors (263077387024).

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

166134640656 is a wasteful number, since it uses less digits than its factorization.

166134640656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248983 (or 248977 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 166134640656 in words is "one hundred sixty-six billion, one hundred thirty-four million, six hundred forty thousand, six hundred fifty-six".