78295671957 has 4 divisors (see below), whose sum is σ = 104394229280. Its totient is φ = 52197114636.

The previous prime is 78295671943. The next prime is 78295672067. The reversal of 78295671957 is 75917659287.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78295671957 - 2¹⁴ = 78295655573 is a prime.

It is a super-2 number, since 2×78295671957² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78295601957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13049278657 + ... + 13049278662.

It is an arithmetic number, because the mean of its divisors is an integer number (26098557320).

Almost surely, 2^78295671957 is an apocalyptic number.

It is an amenable number.

78295671957 is a deficient number, since it is larger than the sum of its proper divisors (26098557323).

78295671957 is a wasteful number, since it uses less digits than its factorization.

78295671957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26098557322.

The product of its digits is 66679200, while the sum is 66.

The spelling of 78295671957 in words is "seventy-eight billion, two hundred ninety-five million, six hundred seventy-one thousand, nine hundred fifty-seven".