168151531806 has 48 divisors (see below), whose sum is σ = 368497350000. Its totient is φ = 55409380224.

The previous prime is 168151531787. The next prime is 168151531813. The reversal of 168151531806 is 608135151861.

It is a happy number.

168151531806 is a `hidden beast` number, since 1 + 68 + 1 + 51 + 531 + 8 + 0 + 6 = 666.

It is a congruent number.

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, 12006400 + ... + 12020396.

It is an arithmetic number, because the mean of its divisors is an integer number (7677028125).

Almost surely, 2^168151531806 is an apocalyptic number.

168151531806 is an abundant number, since it is smaller than the sum of its proper divisors (200345818194).

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

168151531806 is a wasteful number, since it uses less digits than its factorization.

168151531806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21593 (or 21590 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 168151531806 in words is "one hundred sixty-eight billion, one hundred fifty-one million, five hundred thirty-one thousand, eight hundred six".