78369389331 has 4 divisors (see below), whose sum is σ = 104492519112. Its totient is φ = 52246259552.

The previous prime is 78369389321. The next prime is 78369389333. The reversal of 78369389331 is 13398396387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13398396387 = 3 ⋅4466132129.

It is a cyclic number.

It is not a de Polignac number, because 78369389331 - 2²³ = 78361000723 is a prime.

It is a super-2 number, since 2×78369389331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78369389333) 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, 13061564886 + ... + 13061564891.

It is an arithmetic number, because the mean of its divisors is an integer number (26123129778).

Almost surely, 2^78369389331 is an apocalyptic number.

78369389331 is a deficient number, since it is larger than the sum of its proper divisors (26123129781).

78369389331 is a wasteful number, since it uses less digits than its factorization.

78369389331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26123129780.

The product of its digits is 17635968, while the sum is 60.

The spelling of 78369389331 in words is "seventy-eight billion, three hundred sixty-nine million, three hundred eighty-nine thousand, three hundred thirty-one".