78618563451 has 24 divisors (see below), whose sum is σ = 119821042640. Its totient is φ = 49535841600.

The previous prime is 78618563389. The next prime is 78618563459. The reversal of 78618563451 is 15436581687.

It is a happy number.

78618563451 is a `hidden beast` number, since 7 + 8 + 6 + 185 + 6 + 3 + 451 = 666.

It is not a de Polignac number, because 78618563451 - 2⁷ = 78618563323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78618563459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474040 + ... + 618021.

Almost surely, 2^78618563451 is an apocalyptic number.

78618563451 is a deficient number, since it is larger than the sum of its proper divisors (41202479189).

78618563451 is a wasteful number, since it uses less digits than its factorization.

78618563451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092507 (or 1092504 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 78618563451 in words is "seventy-eight billion, six hundred eighteen million, five hundred sixty-three thousand, four hundred fifty-one".