161772323744 has 12 divisors (see below), whose sum is σ = 318489262434. Its totient is φ = 80886161856.

The previous prime is 161772323737. The next prime is 161772323761. The reversal of 161772323744 is 447323277161.

It can be written as a sum of positive squares in only one way, i.e., 109833913744 + 51938410000 = 331412^2 + 227900^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2527692527 + ... + 2527692590.

Almost surely, 2^161772323744 is an apocalyptic number.

It is an amenable number.

161772323744 is a deficient number, since it is larger than the sum of its proper divisors (156716938690).

161772323744 is an equidigital number, since it uses as much as digits as its factorization.

161772323744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055385127 (or 5055385119 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 47.

The spelling of 161772323744 in words is "one hundred sixty-one billion, seven hundred seventy-two million, three hundred twenty-three thousand, seven hundred forty-four".