78115690454 has 4 divisors (see below), whose sum is σ = 117173535684. Its totient is φ = 39057845226.

The previous prime is 78115690453. The next prime is 78115690481. The reversal of 78115690454 is 45409651187.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78115690454² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78115690453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19528922612 + ... + 19528922615.

It is an arithmetic number, because the mean of its divisors is an integer number (29293383921).

Almost surely, 2^78115690454 is an apocalyptic number.

78115690454 is a deficient number, since it is larger than the sum of its proper divisors (39057845230).

78115690454 is a wasteful number, since it uses less digits than its factorization.

78115690454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39057845229.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 78115690454 in words is "seventy-eight billion, one hundred fifteen million, six hundred ninety thousand, four hundred fifty-four".