78745965891 has 8 divisors (see below), whose sum is σ = 106259616960. Its totient is φ = 51864812712.

The previous prime is 78745965889. The next prime is 78745965911. The reversal of 78745965891 is 19856954787.

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

It is not a de Polignac number, because 78745965891 - 2¹ = 78745965889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78745965821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158124181 + ... + 158124678.

It is an arithmetic number, because the mean of its divisors is an integer number (13282452120).

Almost surely, 2^78745965891 is an apocalyptic number.

78745965891 is a deficient number, since it is larger than the sum of its proper divisors (27513651069).

78745965891 is a wasteful number, since it uses less digits than its factorization.

78745965891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316248945.

The product of its digits is 152409600, while the sum is 69.

The spelling of 78745965891 in words is "seventy-eight billion, seven hundred forty-five million, nine hundred sixty-five thousand, eight hundred ninety-one".