78971589061 has 4 divisors (see below), whose sum is σ = 78978683500. Its totient is φ = 78964494624.

The previous prime is 78971589041. The next prime is 78971589181. The reversal of 78971589061 is 16098517987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16098517987 = 1061 ⋅15172967.

It can be written as a sum of positive squares in 2 ways, for example, as 9410164036 + 69561425025 = 97006^2 + 263745^2 .

It is a cyclic number.

It is not a de Polignac number, because 78971589061 - 2²⁵ = 78938034629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78971589041) 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, 3530496 + ... + 3552793.

It is an arithmetic number, because the mean of its divisors is an integer number (19744670875).

Almost surely, 2^78971589061 is an apocalyptic number.

It is an amenable number.

78971589061 is a deficient number, since it is larger than the sum of its proper divisors (7094439).

78971589061 is a wasteful number, since it uses less digits than its factorization.

78971589061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7094438.

The product of its (nonzero) digits is 7620480, while the sum is 61.

The spelling of 78971589061 in words is "seventy-eight billion, nine hundred seventy-one million, five hundred eighty-nine thousand, sixty-one".