78157663875 has 48 divisors (see below), whose sum is σ = 141049395552. Its totient is φ = 41637585600.

The previous prime is 78157663849. The next prime is 78157663933. The reversal of 78157663875 is 57836675187.

It is not a de Polignac number, because 78157663875 - 2¹⁰ = 78157662851 is a prime.

It is a super-2 number, since 2×78157663875² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 982077 + ... + 1058673.

It is an arithmetic number, because the mean of its divisors is an integer number (2938529074).

Almost surely, 2^78157663875 is an apocalyptic number.

78157663875 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78157663875 is a deficient number, since it is larger than the sum of its proper divisors (62891731677).

78157663875 is a wasteful number, since it uses less digits than its factorization.

78157663875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77525 (or 77512 counting only the distinct ones).

The product of its digits is 59270400, while the sum is 63.

The spelling of 78157663875 in words is "seventy-eight billion, one hundred fifty-seven million, six hundred sixty-three thousand, eight hundred seventy-five".