161953677 has 12 divisors (see below), whose sum is σ = 234180700. Its totient is φ = 107854848.

The previous prime is 161953669. The next prime is 161953697. The reversal of 161953677 is 776359161.

It can be written as a sum of positive squares in 2 ways, for example, as 139854276 + 22099401 = 11826^2 + 4701^2 .

It is not a de Polignac number, because 161953677 - 2³ = 161953669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161953657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52 + ... + 17997.

Almost surely, 2^161953677 is an apocalyptic number.

It is an amenable number.

161953677 is a deficient number, since it is larger than the sum of its proper divisors (72227023).

161953677 is a wasteful number, since it uses less digits than its factorization.

161953677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19052 (or 19049 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 161953677 is about 12726.1021919518. The cubic root of 161953677 is about 545.0842133425.

The spelling of 161953677 in words is "one hundred sixty-one million, nine hundred fifty-three thousand, six hundred seventy-seven".