78009959565 has 12 divisors (see below), whose sum is σ = 135217263324. Its totient is φ = 41605311744.

The previous prime is 78009959557. The next prime is 78009959633. The reversal of 78009959565 is 56595990087.

It can be written as a sum of positive squares in 2 ways, for example, as 40122894249 + 37887065316 = 200307^2 + 194646^2 .

It is not a de Polignac number, because 78009959565 - 2³ = 78009959557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 866777284 + ... + 866777373.

It is an arithmetic number, because the mean of its divisors is an integer number (11268105277).

Almost surely, 2^78009959565 is an apocalyptic number.

It is an amenable number.

78009959565 is a deficient number, since it is larger than the sum of its proper divisors (57207303759).

78009959565 is a wasteful number, since it uses less digits than its factorization.

78009959565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733554668 (or 1733554665 counting only the distinct ones).

The product of its (nonzero) digits is 30618000, while the sum is 63.

The spelling of 78009959565 in words is "seventy-eight billion, nine million, nine hundred fifty-nine thousand, five hundred sixty-five".