161504215504 has 40 divisors (see below), whose sum is σ = 316060485120. Its totient is φ = 79944081408.

The previous prime is 161504215469. The next prime is 161504215513. The reversal of 161504215504 is 405512405161.

It is a super-2 number, since 2×161504215504² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161504215504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549777 + ... + 790735.

It is an arithmetic number, because the mean of its divisors is an integer number (7901512128).

Almost surely, 2^161504215504 is an apocalyptic number.

It is an amenable number.

161504215504 is a deficient number, since it is larger than the sum of its proper divisors (154556269616).

161504215504 is a wasteful number, since it uses less digits than its factorization.

161504215504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241387 (or 241381 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 161504215504 in words is "one hundred sixty-one billion, five hundred four million, two hundred fifteen thousand, five hundred four".