161507638 has 16 divisors (see below), whose sum is σ = 255744000. Its totient is φ = 76284072.

The previous prime is 161507617. The next prime is 161507659. The reversal of 161507638 is 836705161.

161507638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161507617) and next prime (161507659).

It is a junction number, because it is equal to n+sod(n) for n = 161507597 and 161507606.

It is a congruent number.

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, 7723 + ... + 19561.

It is an arithmetic number, because the mean of its divisors is an integer number (15984000).

Almost surely, 2^161507638 is an apocalyptic number.

161507638 is a deficient number, since it is larger than the sum of its proper divisors (94236362).

161507638 is a wasteful number, since it uses less digits than its factorization.

161507638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12219.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 161507638 is about 12708.5655366764. The cubic root of 161507638 is about 544.5833450991.

The spelling of 161507638 in words is "one hundred sixty-one million, five hundred seven thousand, six hundred thirty-eight".