87500477917 has 2 divisors, whose sum is σ = 87500477918. Its totient is φ = 87500477916.

The previous prime is 87500477863. The next prime is 87500477923. The reversal of 87500477917 is 71977400578.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60510588121 + 26989889796 = 245989^2 + 164286^2 .

It is a cyclic number.

It is not a de Polignac number, because 87500477917 - 2⁷ = 87500477789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87500477017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43750238958 + 43750238959.

It is an arithmetic number, because the mean of its divisors is an integer number (43750238959).

Almost surely, 2^87500477917 is an apocalyptic number.

It is an amenable number.

87500477917 is a deficient number, since it is larger than the sum of its proper divisors (1).

87500477917 is an equidigital number, since it uses as much as digits as its factorization.

87500477917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3457440, while the sum is 55.

The spelling of 87500477917 in words is "eighty-seven billion, five hundred million, four hundred seventy-seven thousand, nine hundred seventeen".