166531881802 has 64 divisors (see below), whose sum is σ = 297888917760. Its totient is φ = 68823014400.

The previous prime is 166531881793. The next prime is 166531881829. The reversal of 166531881802 is 208188135661.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24952738 + ... + 24959410.

It is an arithmetic number, because the mean of its divisors is an integer number (4654514340).

Almost surely, 2^166531881802 is an apocalyptic number.

166531881802 is a deficient number, since it is larger than the sum of its proper divisors (131357035958).

166531881802 is a wasteful number, since it uses less digits than its factorization.

166531881802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7999.

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 166531881802 in words is "one hundred sixty-six billion, five hundred thirty-one million, eight hundred eighty-one thousand, eight hundred two".