79857615961523 has 2 divisors, whose sum is σ = 79857615961524. Its totient is φ = 79857615961522.

The previous prime is 79857615961517. The next prime is 79857615961537. The reversal of 79857615961523 is 32516951675897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79857615961523 - 2²⁸ = 79857347526067 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (79857615966523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39928807980761 + 39928807980762.

It is an arithmetic number, because the mean of its divisors is an integer number (39928807980762).

Almost surely, 2^{79857615961523} is an apocalyptic number.

79857615961523 is a deficient number, since it is larger than the sum of its proper divisors (1).

79857615961523 is an equidigital number, since it uses as much as digits as its factorization.

79857615961523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304000, while the sum is 74.

The spelling of 79857615961523 in words is "seventy-nine trillion, eight hundred fifty-seven billion, six hundred fifteen million, nine hundred sixty-one thousand, five hundred twenty-three".