78396642351 has 12 divisors (see below), whose sum is σ = 113872220280. Its totient is φ = 51972447120.

The previous prime is 78396642323. The next prime is 78396642377. The reversal of 78396642351 is 15324669387.

78396642351 is a `hidden beast` number, since 7 + 83 + 96 + 6 + 423 + 51 = 666.

It is not a de Polignac number, because 78396642351 - 2⁶ = 78396642287 is a prime.

It is a super-2 number, since 2×78396642351² (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 (78396642151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24330060 + ... + 24333281.

It is an arithmetic number, because the mean of its divisors is an integer number (9489351690).

Almost surely, 2^78396642351 is an apocalyptic number.

78396642351 is a deficient number, since it is larger than the sum of its proper divisors (35475577929).

78396642351 is a wasteful number, since it uses less digits than its factorization.

78396642351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48663526 (or 48663523 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 78396642351 in words is "seventy-eight billion, three hundred ninety-six million, six hundred forty-two thousand, three hundred fifty-one".