87377643697 has 2 divisors, whose sum is σ = 87377643698. Its totient is φ = 87377643696.

The previous prime is 87377643667. The next prime is 87377643721. The reversal of 87377643697 is 79634677378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43813187856 + 43564455841 = 209316^2 + 208721^2 .

It is a cyclic number.

It is not a de Polignac number, because 87377643697 - 2³¹ = 85230160049 is a prime.

It is not a weakly prime, because it can be changed into another prime (87377643667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43688821848 + 43688821849.

It is an arithmetic number, because the mean of its divisors is an integer number (43688821849).

Almost surely, 2^87377643697 is an apocalyptic number.

It is an amenable number.

87377643697 is a deficient number, since it is larger than the sum of its proper divisors (1).

87377643697 is an equidigital number, since it uses as much as digits as its factorization.

87377643697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224042112, while the sum is 67.

The spelling of 87377643697 in words is "eighty-seven billion, three hundred seventy-seven million, six hundred forty-three thousand, six hundred ninety-seven".