166501551636 has 72 divisors (see below), whose sum is σ = 481481931840. Its totient is φ = 47524651776.

The previous prime is 166501551599. The next prime is 166501551673. The reversal of 166501551636 is 636155105661.

166501551636 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 0 + 1 + 5 + 5 + 1 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (166501551599) and next prime (166501551673).

It is a junction number, because it is equal to n+sod(n) for n = 166501551591 and 166501551600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73146 + ... + 581681.

Almost surely, 2^166501551636 is an apocalyptic number.

It is an amenable number.

166501551636 is an abundant number, since it is smaller than the sum of its proper divisors (314980380204).

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

166501551636 is a wasteful number, since it uses less digits than its factorization.

166501551636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655853 (or 655848 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 166501551636 in words is "one hundred sixty-six billion, five hundred one million, five hundred fifty-one thousand, six hundred thirty-six".