87646064677 has 2 divisors, whose sum is σ = 87646064678. Its totient is φ = 87646064676.

The previous prime is 87646064659. The next prime is 87646064711. The reversal of 87646064677 is 77646064678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83841518916 + 3804545761 = 289554^2 + 61681^2 .

It is a cyclic number.

It is not a de Polignac number, because 87646064677 - 2⁷ = 87646064549 is a prime.

It is a super-2 number, since 2×87646064677² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87646064657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43823032338 + 43823032339.

It is an arithmetic number, because the mean of its divisors is an integer number (43823032339).

Almost surely, 2^87646064677 is an apocalyptic number.

It is an amenable number.

87646064677 is a deficient number, since it is larger than the sum of its proper divisors (1).

87646064677 is an equidigital number, since it uses as much as digits as its factorization.

87646064677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56899584, while the sum is 61.

Subtracting from 87646064677 its reverse (77646064678), we obtain a palindrome (9999999999).

The spelling of 87646064677 in words is "eighty-seven billion, six hundred forty-six million, sixty-four thousand, six hundred seventy-seven".