78050021613 has 4 divisors (see below), whose sum is σ = 104066695488. Its totient is φ = 52033347740.

The previous prime is 78050021593. The next prime is 78050021617. The reversal of 78050021613 is 31612005087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78050021613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78050021617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13008336933 + ... + 13008336938.

It is an arithmetic number, because the mean of its divisors is an integer number (26016673872).

Almost surely, 2^78050021613 is an apocalyptic number.

It is an amenable number.

78050021613 is a deficient number, since it is larger than the sum of its proper divisors (26016673875).

78050021613 is a wasteful number, since it uses less digits than its factorization.

78050021613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26016673874.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 78050021613 in words is "seventy-eight billion, fifty million, twenty-one thousand, six hundred thirteen".