78508564265 has 8 divisors (see below), whose sum is σ = 94212655368. Its totient is φ = 62805265920.

The previous prime is 78508564237. The next prime is 78508564279. The reversal of 78508564265 is 56246580587.

It can be written as a sum of positive squares in 4 ways, for example, as 1817231641 + 76691332624 = 42629^2 + 276932^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78508564265 - 2⁸ = 78508564009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78508564265.

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, 47339 + ... + 399071.

It is an arithmetic number, because the mean of its divisors is an integer number (11776581921).

Almost surely, 2^78508564265 is an apocalyptic number.

It is an amenable number.

78508564265 is a deficient number, since it is larger than the sum of its proper divisors (15704091103).

78508564265 is a wasteful number, since it uses less digits than its factorization.

78508564265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396379.

The product of its (nonzero) digits is 16128000, while the sum is 56.

The spelling of 78508564265 in words is "seventy-eight billion, five hundred eight million, five hundred sixty-four thousand, two hundred sixty-five".