108515564978 has 18 divisors (see below), whose sum is σ = 164357291511. Its totient is φ = 53734847904.

The previous prime is 108515564953. The next prime is 108515564981. The reversal of 108515564978 is 879465515801.

It can be written as a sum of positive squares in 5 ways, for example, as 17804365489 + 90711199489 = 133433^2 + 301183^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=232933.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 50778326 + ... + 50780462.

Almost surely, 2^108515564978 is an apocalyptic number.

108515564978 is a deficient number, since it is larger than the sum of its proper divisors (55841726533).

108515564978 is an frugal number, since it uses more digits than its factorization.

108515564978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4494 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 59.

The spelling of 108515564978 in words is "one hundred eight billion, five hundred fifteen million, five hundred sixty-four thousand, nine hundred seventy-eight".