79857615961537 has 2 divisors, whose sum is σ = 79857615961538. Its totient is φ = 79857615961536.

The previous prime is 79857615961523. The next prime is 79857615961561. The reversal of 79857615961537 is 73516951675897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56828741018256 + 23028874943281 = 7538484^2 + 4798841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79857615961537 is a prime.

It is not a weakly prime, because it can be changed into another prime (79857615961517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39928807980768 + 39928807980769.

It is an arithmetic number, because the mean of its divisors is an integer number (39928807980769).

Almost surely, 2^{79857615961537} is an apocalyptic number.

It is an amenable number.

79857615961537 is a deficient number, since it is larger than the sum of its proper divisors (1).

79857615961537 is an equidigital number, since it uses as much as digits as its factorization.

79857615961537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000564000, while the sum is 79.

The spelling of 79857615961537 in words is "seventy-nine trillion, eight hundred fifty-seven billion, six hundred fifteen million, nine hundred sixty-one thousand, five hundred thirty-seven".