78156528775 has 24 divisors (see below), whose sum is σ = 105626520720. Its totient is φ = 57020202240.

The previous prime is 78156528763. The next prime is 78156528809. The reversal of 78156528775 is 57782565187.

It is a happy number.

It is not a de Polignac number, because 78156528775 - 2⁵ = 78156528743 is a prime.

It is a super-2 number, since 2×78156528775² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1421710 + ... + 1475659.

It is an arithmetic number, because the mean of its divisors is an integer number (4401105030).

Almost surely, 2^78156528775 is an apocalyptic number.

78156528775 is a deficient number, since it is larger than the sum of its proper divisors (27469991945).

78156528775 is a wasteful number, since it uses less digits than its factorization.

78156528775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897475 (or 2897470 counting only the distinct ones).

The product of its digits is 32928000, while the sum is 61.

The spelling of 78156528775 in words is "seventy-eight billion, one hundred fifty-six million, five hundred twenty-eight thousand, seven hundred seventy-five".