87637810609 has 2 divisors, whose sum is σ = 87637810610. Its totient is φ = 87637810608.

The previous prime is 87637810607. The next prime is 87637810879. The reversal of 87637810609 is 90601873678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62186394384 + 25451416225 = 249372^2 + 159535^2 .

It is a cyclic number.

It is not a de Polignac number, because 87637810609 - 2¹ = 87637810607 is a prime.

Together with 87637810607, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 87637810609.

It is not a weakly prime, because it can be changed into another prime (87637810607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43818905304 + 43818905305.

It is an arithmetic number, because the mean of its divisors is an integer number (43818905305).

Almost surely, 2^87637810609 is an apocalyptic number.

It is an amenable number.

87637810609 is a deficient number, since it is larger than the sum of its proper divisors (1).

87637810609 is an equidigital number, since it uses as much as digits as its factorization.

87637810609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 87637810609 in words is "eighty-seven billion, six hundred thirty-seven million, eight hundred ten thousand, six hundred nine".