87657613709 has 2 divisors, whose sum is σ = 87657613710. Its totient is φ = 87657613708.

The previous prime is 87657613661. The next prime is 87657613741. The reversal of 87657613709 is 90731675678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80059004809 + 7598608900 = 282947^2 + 87170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87657613709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87657612709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43828806854 + 43828806855.

It is an arithmetic number, because the mean of its divisors is an integer number (43828806855).

Almost surely, 2^87657613709 is an apocalyptic number.

It is an amenable number.

87657613709 is a deficient number, since it is larger than the sum of its proper divisors (1).

87657613709 is an equidigital number, since it uses as much as digits as its factorization.

87657613709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13335840, while the sum is 59.

The spelling of 87657613709 in words is "eighty-seven billion, six hundred fifty-seven million, six hundred thirteen thousand, seven hundred nine".