87719824613 has 2 divisors, whose sum is σ = 87719824614. Its totient is φ = 87719824612.

The previous prime is 87719824601. The next prime is 87719824681. The reversal of 87719824613 is 31642891778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87558585409 + 161239204 = 295903^2 + 12698^2 .

It is a cyclic number.

It is not a de Polignac number, because 87719824613 - 2¹⁴ = 87719808229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87719884613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43859912306 + 43859912307.

It is an arithmetic number, because the mean of its divisors is an integer number (43859912307).

Almost surely, 2^87719824613 is an apocalyptic number.

It is an amenable number.

87719824613 is a deficient number, since it is larger than the sum of its proper divisors (1).

87719824613 is an equidigital number, since it uses as much as digits as its factorization.

87719824613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 56.

The spelling of 87719824613 in words is "eighty-seven billion, seven hundred nineteen million, eight hundred twenty-four thousand, six hundred thirteen".