78459818553 has 12 divisors (see below), whose sum is σ = 113333276628. Its totient is φ = 52305425280.

The previous prime is 78459818539. The next prime is 78459818617. The reversal of 78459818553 is 35581895487.

78459818553 is a `hidden beast` number, since 78 + 4 + 5 + 9 + 8 + 1 + 8 + 553 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 72074530089 + 6385288464 = 268467^2 + 79908^2 .

It is not a de Polignac number, because 78459818553 - 2⁴ = 78459818537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78459818453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 792573 + ... + 886053.

It is an arithmetic number, because the mean of its divisors is an integer number (9444439719).

Almost surely, 2^78459818553 is an apocalyptic number.

It is an amenable number.

78459818553 is a deficient number, since it is larger than the sum of its proper divisors (34873458075).

78459818553 is a wasteful number, since it uses less digits than its factorization.

78459818553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186744 (or 186741 counting only the distinct ones).

The product of its digits is 48384000, while the sum is 63.

The spelling of 78459818553 in words is "seventy-eight billion, four hundred fifty-nine million, eight hundred eighteen thousand, five hundred fifty-three".