163307870721 has 6 divisors (see below), whose sum is σ = 235889146610. Its totient is φ = 108871913808.

The previous prime is 163307870641. The next prime is 163307870731. The reversal of 163307870721 is 127078703361.

163307870721 is a `hidden beast` number, since 1 + 633 + 0 + 7 + 8 + 7 + 0 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 85319489025 + 77988381696 = 292095^2 + 279264^2 .

It is not a de Polignac number, because 163307870721 - 2¹⁷ = 163307739649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163307870731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9072659476 + ... + 9072659493.

Almost surely, 2^163307870721 is an apocalyptic number.

It is an amenable number.

163307870721 is a deficient number, since it is larger than the sum of its proper divisors (72581275889).

163307870721 is a wasteful number, since it uses less digits than its factorization.

163307870721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18145318975 (or 18145318972 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The spelling of 163307870721 in words is "one hundred sixty-three billion, three hundred seven million, eight hundred seventy thousand, seven hundred twenty-one".