87506990666 has 4 divisors (see below), whose sum is σ = 131260486002. Its totient is φ = 43753495332.

The previous prime is 87506990651. The next prime is 87506990671. The reversal of 87506990666 is 66609960578.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 84112180441 + 3394810225 = 290021^2 + 58265^2 .

It is a super-2 number, since 2×87506990666² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87506990599 and 87506990608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21876747665 + ... + 21876747668.

Almost surely, 2^87506990666 is an apocalyptic number.

87506990666 is a deficient number, since it is larger than the sum of its proper divisors (43753495336).

87506990666 is a wasteful number, since it uses less digits than its factorization.

87506990666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43753495335.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 87506990666 in words is "eighty-seven billion, five hundred six million, nine hundred ninety thousand, six hundred sixty-six".