78375351940665 has 32 divisors (see below), whose sum is σ = 135049403333376. Its totient is φ = 38584033486080.

The previous prime is 78375351940573. The next prime is 78375351940751. The reversal of 78375351940665 is 56604915357387.

It is not a de Polignac number, because 78375351940665 - 2¹⁶ = 78375351875129 is a prime.

It is a super-2 number, since 2×78375351940665² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78375351940665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6121627 + ... + 13936463.

It is an arithmetic number, because the mean of its divisors is an integer number (4220293854168).

Almost surely, 2^{78375351940665} is an apocalyptic number.

It is an amenable number.

78375351940665 is a deficient number, since it is larger than the sum of its proper divisors (56674051392711).

78375351940665 is a wasteful number, since it uses less digits than its factorization.

78375351940665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7866289.

The product of its (nonzero) digits is 571536000, while the sum is 69.

The spelling of 78375351940665 in words is "seventy-eight trillion, three hundred seventy-five billion, three hundred fifty-one million, nine hundred forty thousand, six hundred sixty-five".