638407027161 has 24 divisors (see below), whose sum is σ = 925514453760. Its totient is φ = 424051135200.

The previous prime is 638407027147. The next prime is 638407027177. The reversal of 638407027161 is 161720704836.

638407027161 is a `hidden beast` number, since 63 + 8 + 407 + 0 + 27 + 161 = 666.

It is not a de Polignac number, because 638407027161 - 2⁷ = 638407027033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638407027261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3285871 + ... + 3474731.

It is an arithmetic number, because the mean of its divisors is an integer number (38563102240).

Almost surely, 2^638407027161 is an apocalyptic number.

It is an amenable number.

638407027161 is a deficient number, since it is larger than the sum of its proper divisors (287107426599).

638407027161 is a wasteful number, since it uses less digits than its factorization.

638407027161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190237 (or 190234 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 638407027161 in words is "six hundred thirty-eight billion, four hundred seven million, twenty-seven thousand, one hundred sixty-one".