78585261871538 has 16 divisors (see below), whose sum is σ = 118981108570464. Its totient is φ = 38924901936000.

The previous prime is 78585261871517. The next prime is 78585261871559. The reversal of 78585261871538 is 83517816258587.

It is an interprime number because it is at equal distance from previous prime (78585261871517) and next prime (78585261871559).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14305538 + ... + 19021538.

It is an arithmetic number, because the mean of its divisors is an integer number (7436319285654).

Almost surely, 2^{78585261871538} is an apocalyptic number.

78585261871538 is a deficient number, since it is larger than the sum of its proper divisors (40395846698926).

78585261871538 is a wasteful number, since it uses less digits than its factorization.

78585261871538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4793977.

The product of its digits is 903168000, while the sum is 74.

The spelling of 78585261871538 in words is "seventy-eight trillion, five hundred eighty-five billion, two hundred sixty-one million, eight hundred seventy-one thousand, five hundred thirty-eight".