161635738 has 16 divisors (see below), whose sum is σ = 267845760. Its totient is φ = 72540000.

The previous prime is 161635729. The next prime is 161635741. The reversal of 161635738 is 837536161.

It is a happy number.

161635738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161635738² = 52252223597609288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161635738.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44763 + ... + 48238.

It is an arithmetic number, because the mean of its divisors is an integer number (16740360).

Almost surely, 2^161635738 is an apocalyptic number.

161635738 is a deficient number, since it is larger than the sum of its proper divisors (106210022).

161635738 is a wasteful number, since it uses less digits than its factorization.

161635738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93093.

The product of its digits is 90720, while the sum is 40.

The square root of 161635738 is about 12713.6044456322. The cubic root of 161635738 is about 544.7272860540.

The spelling of 161635738 in words is "one hundred sixty-one million, six hundred thirty-five thousand, seven hundred thirty-eight".