166651505601 has 16 divisors (see below), whose sum is σ = 257423854464. Its totient is φ = 93924918144.

The previous prime is 166651505593. The next prime is 166651505611. The reversal of 166651505601 is 106505156661.

It is not a de Polignac number, because 166651505601 - 2³ = 166651505593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166651505611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54353166 + ... + 54356231.

It is an arithmetic number, because the mean of its divisors is an integer number (16088990904).

Almost surely, 2^166651505601 is an apocalyptic number.

It is an amenable number.

166651505601 is a deficient number, since it is larger than the sum of its proper divisors (90772348863).

166651505601 is a wasteful number, since it uses less digits than its factorization.

166651505601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108709480.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 166651505601 in words is "one hundred sixty-six billion, six hundred fifty-one million, five hundred five thousand, six hundred one".