154979521768 has 8 divisors (see below), whose sum is σ = 290586603330. Its totient is φ = 77489760880.

The previous prime is 154979521747. The next prime is 154979521783. The reversal of 154979521768 is 867125979451.

154979521768 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 154765133604 + 214388164 = 393402^2 + 14642^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9686220103 + ... + 9686220118.

Almost surely, 2^154979521768 is an apocalyptic number.

It is an amenable number.

154979521768 is a deficient number, since it is larger than the sum of its proper divisors (135607081562).

154979521768 is a wasteful number, since it uses less digits than its factorization.

154979521768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19372440227 (or 19372440223 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 64.

The spelling of 154979521768 in words is "one hundred fifty-four billion, nine hundred seventy-nine million, five hundred twenty-one thousand, seven hundred sixty-eight".