161404812538 has 8 divisors (see below), whose sum is σ = 242145263232. Its totient is φ = 80689724796.

The previous prime is 161404812479. The next prime is 161404812557. The reversal of 161404812538 is 835218404161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 161404812494 and 161404812503.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6324820 + ... + 6350287.

It is an arithmetic number, because the mean of its divisors is an integer number (30268157904).

Almost surely, 2^161404812538 is an apocalyptic number.

161404812538 is a deficient number, since it is larger than the sum of its proper divisors (80740450694).

161404812538 is a wasteful number, since it uses less digits than its factorization.

161404812538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12681476.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 161404812538 in words is "one hundred sixty-one billion, four hundred four million, eight hundred twelve thousand, five hundred thirty-eight".