161776672 has 12 divisors (see below), whose sum is σ = 318497886. Its totient is φ = 80888320.

The previous prime is 161776661. The next prime is 161776673. The reversal of 161776672 is 276677161.

It can be written as a sum of positive squares in only one way, i.e., 149915536 + 11861136 = 12244^2 + 3444^2 .

It is not an unprimeable number, because it can be changed into a prime (161776673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2527729 + ... + 2527792.

Almost surely, 2^161776672 is an apocalyptic number.

It is an amenable number.

161776672 is a deficient number, since it is larger than the sum of its proper divisors (156721214).

161776672 is an equidigital number, since it uses as much as digits as its factorization.

161776672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055531 (or 5055523 counting only the distinct ones).

The product of its digits is 148176, while the sum is 43.

The square root of 161776672 is about 12719.1458832738. The cubic root of 161776672 is about 544.8855602377.

The spelling of 161776672 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, six hundred seventy-two".