87372279517 has 2 divisors, whose sum is σ = 87372279518. Its totient is φ = 87372279516.

The previous prime is 87372279439. The next prime is 87372279587. The reversal of 87372279517 is 71597227378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87319659001 + 52620516 = 295499^2 + 7254^2 .

It is a cyclic number.

It is not a de Polignac number, because 87372279517 - 2¹⁵ = 87372246749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87372279587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43686139758 + 43686139759.

It is an arithmetic number, because the mean of its divisors is an integer number (43686139759).

Almost surely, 2^87372279517 is an apocalyptic number.

It is an amenable number.

87372279517 is a deficient number, since it is larger than the sum of its proper divisors (1).

87372279517 is an equidigital number, since it uses as much as digits as its factorization.

87372279517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10372320, while the sum is 58.

The spelling of 87372279517 in words is "eighty-seven billion, three hundred seventy-two million, two hundred seventy-nine thousand, five hundred seventeen".