161839707772 has 24 divisors (see below), whose sum is σ = 291008138960. Its totient is φ = 78696541440.

The previous prime is 161839707767. The next prime is 161839707773. The reversal of 161839707772 is 277707938161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161839707773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71572 + ... + 573412.

Almost surely, 2^161839707772 is an apocalyptic number.

It is an amenable number.

161839707772 is a deficient number, since it is larger than the sum of its proper divisors (129168431188).

161839707772 is a wasteful number, since it uses less digits than its factorization.

161839707772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504061 (or 504059 counting only the distinct ones).

The product of its (nonzero) digits is 6223392, while the sum is 58.

The spelling of 161839707772 in words is "one hundred sixty-one billion, eight hundred thirty-nine million, seven hundred seven thousand, seven hundred seventy-two".