78625536391 has 16 divisors (see below), whose sum is σ = 82150391808. Its totient is φ = 75197046400.

The previous prime is 78625536383. The next prime is 78625536403. The reversal of 78625536391 is 19363552687.

It is a cyclic number.

It is not a de Polignac number, because 78625536391 - 2³ = 78625536383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78625536371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272826 + ... + 481336.

It is an arithmetic number, because the mean of its divisors is an integer number (5134399488).

Almost surely, 2^78625536391 is an apocalyptic number.

78625536391 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78625536391 is a deficient number, since it is larger than the sum of its proper divisors (3524855417).

78625536391 is a wasteful number, since it uses less digits than its factorization.

78625536391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208742.

The product of its digits is 8164800, while the sum is 55.

The spelling of 78625536391 in words is "seventy-eight billion, six hundred twenty-five million, five hundred thirty-six thousand, three hundred ninety-one".