161519479138 has 8 divisors (see below), whose sum is σ = 242342604288. Its totient is φ = 80738611044.

The previous prime is 161519479117. The next prime is 161519479141. The reversal of 161519479138 is 831974915161.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10554706 + ... + 10569997.

It is an arithmetic number, because the mean of its divisors is an integer number (30292825536).

Almost surely, 2^161519479138 is an apocalyptic number.

161519479138 is a deficient number, since it is larger than the sum of its proper divisors (80823125150).

161519479138 is a wasteful number, since it uses less digits than its factorization.

161519479138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21128528.

The product of its digits is 1632960, while the sum is 55.

The spelling of 161519479138 in words is "one hundred sixty-one billion, five hundred nineteen million, four hundred seventy-nine thousand, one hundred thirty-eight".