18915354856 has 8 divisors (see below), whose sum is σ = 35466290370. Its totient is φ = 9457677424.

The previous prime is 18915354781. The next prime is 18915354869. The reversal of 18915354856 is 65845351981.

It can be written as a sum of positive squares in only one way, i.e., 18805733956 + 109620900 = 137134^2 + 10470^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18915354797 and 18915354806.

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 as a sum of consecutive naturals, namely, 1182209671 + ... + 1182209686.

Almost surely, 2^18915354856 is an apocalyptic number.

It is an amenable number.

18915354856 is a deficient number, since it is larger than the sum of its proper divisors (16550935514).

18915354856 is a wasteful number, since it uses less digits than its factorization.

18915354856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364419363 (or 2364419359 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 55.

The spelling of 18915354856 in words is "eighteen billion, nine hundred fifteen million, three hundred fifty-four thousand, eight hundred fifty-six".