78972558337 has 4 divisors (see below), whose sum is σ = 79408870996. Its totient is φ = 78536245680.

The previous prime is 78972558317. The next prime is 78972558361. The reversal of 78972558337 is 73385527987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11707023601 + 67265534736 = 108199^2 + 259356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78972558337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78972558307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218156058 + ... + 218156419.

It is an arithmetic number, because the mean of its divisors is an integer number (19852217749).

Almost surely, 2^78972558337 is an apocalyptic number.

It is an amenable number.

78972558337 is a deficient number, since it is larger than the sum of its proper divisors (436312659).

78972558337 is a wasteful number, since it uses less digits than its factorization.

78972558337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436312658.

The product of its digits is 88905600, while the sum is 64.

The spelling of 78972558337 in words is "seventy-eight billion, nine hundred seventy-two million, five hundred fifty-eight thousand, three hundred thirty-seven".