636161672 has 16 divisors (see below), whose sum is σ = 1193164560. Its totient is φ = 317984464.

The previous prime is 636161611. The next prime is 636161707. The reversal of 636161672 is 276161636.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21503 + ... + 41649.

It is an arithmetic number, because the mean of its divisors is an integer number (74572785).

Almost surely, 2^636161672 is an apocalyptic number.

It is an amenable number.

636161672 is a deficient number, since it is larger than the sum of its proper divisors (557002888).

636161672 is a wasteful number, since it uses less digits than its factorization.

636161672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24100 (or 24096 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 636161672 is about 25222.2455780606. The cubic root of 636161672 is about 860.0476231064.

The spelling of 636161672 in words is "six hundred thirty-six million, one hundred sixty-one thousand, six hundred seventy-two".