166557663867 has 32 divisors (see below), whose sum is σ = 256300153344. Its totient is φ = 94239936000.

The previous prime is 166557663823. The next prime is 166557663869. The reversal of 166557663867 is 768366755661.

It is not a de Polignac number, because 166557663867 - 2⁷ = 166557663739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166557663798 and 166557663807.

It is not an unprimeable number, because it can be changed into a prime (166557663869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4838617 + ... + 4872917.

It is an arithmetic number, because the mean of its divisors is an integer number (8009379792).

Almost surely, 2^166557663867 is an apocalyptic number.

166557663867 is a deficient number, since it is larger than the sum of its proper divisors (89742489477).

166557663867 is a wasteful number, since it uses less digits than its factorization.

166557663867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36579.

The product of its digits is 228614400, while the sum is 66.

The spelling of 166557663867 in words is "one hundred sixty-six billion, five hundred fifty-seven million, six hundred sixty-three thousand, eight hundred sixty-seven".