78689650555 has 4 divisors (see below), whose sum is σ = 94427580672. Its totient is φ = 62951720440.

The previous prime is 78689650549. The next prime is 78689650573. The reversal of 78689650555 is 55505698687.

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

It is not a de Polignac number, because 78689650555 - 2³ = 78689650547 is a prime.

It is a super-2 number, since 2×78689650555² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7868965051 + ... + 7868965060.

It is an arithmetic number, because the mean of its divisors is an integer number (23606895168).

Almost surely, 2^78689650555 is an apocalyptic number.

78689650555 is a deficient number, since it is larger than the sum of its proper divisors (15737930117).

78689650555 is a wasteful number, since it uses less digits than its factorization.

78689650555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15737930116.

The product of its (nonzero) digits is 90720000, while the sum is 64.

The spelling of 78689650555 in words is "seventy-eight billion, six hundred eighty-nine million, six hundred fifty thousand, five hundred fifty-five".