166571358107428 has 6 divisors (see below), whose sum is σ = 291499876688006. Its totient is φ = 83285679053712.

The previous prime is 166571358107411. The next prime is 166571358107437. The reversal of 166571358107428 is 824701853175661.

It can be written as a sum of positive squares in only one way, i.e., 151062584725504 + 15508773381924 = 12290752^2 + 3938118^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166571358107428.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20821419763425 + ... + 20821419763432.

Almost surely, 2^{166571358107428} is an apocalyptic number.

It is an amenable number.

166571358107428 is a deficient number, since it is larger than the sum of its proper divisors (124928518580578).

166571358107428 is a wasteful number, since it uses less digits than its factorization.

166571358107428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41642839526861 (or 41642839526859 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 64.

The spelling of 166571358107428 in words is "one hundred sixty-six trillion, five hundred seventy-one billion, three hundred fifty-eight million, one hundred seven thousand, four hundred twenty-eight".