161272903824 has 100 divisors (see below), whose sum is σ = 471392446140. Its totient is φ = 53225337600.

The previous prime is 161272903801. The next prime is 161272903843. The reversal of 161272903824 is 428309272161.

161272903824 is a `hidden beast` number, since 1 + 612 + 7 + 2 + 9 + 0 + 3 + 8 + 24 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 74129863824 + 87143040000 = 272268^2 + 295200^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 161272903824.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 485139 + ... + 746930.

Almost surely, 2^161272903824 is an apocalyptic number.

It is an amenable number.

161272903824 is an abundant number, since it is smaller than the sum of its proper divisors (310119542316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161272903824 is a wasteful number, since it uses less digits than its factorization.

161272903824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232190 (or 1232175 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 161272903824 in words is "one hundred sixty-one billion, two hundred seventy-two million, nine hundred three thousand, eight hundred twenty-four".