78903405920556 has 120 divisors (see below), whose sum is σ = 248143265018880. Its totient is φ = 21357312869088.

The previous prime is 78903405920539. The next prime is 78903405920579. The reversal of 78903405920556 is 65502950430987.

78903405920556 is a `hidden beast` number, since 7 + 8 + 9 + 0 + 3 + 4 + 0 + 59 + 20 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 78903405920493 and 78903405920502.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 915479580 + ... + 915565763.

It is an arithmetic number, because the mean of its divisors is an integer number (2067860541824).

Almost surely, 2^{78903405920556} is an apocalyptic number.

78903405920556 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78903405920556 is an abundant number, since it is smaller than the sum of its proper divisors (169239859098324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78903405920556 is a wasteful number, since it uses less digits than its factorization.

78903405920556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831045385 (or 1831045374 counting only the distinct ones).

The product of its (nonzero) digits is 81648000, while the sum is 63.

The spelling of 78903405920556 in words is "seventy-eight trillion, nine hundred three billion, four hundred five million, nine hundred twenty thousand, five hundred fifty-six".