661244442166 has 80 divisors (see below), whose sum is σ = 1270675577088. Its totient is φ = 255918474000.

The previous prime is 661244442109. The next prime is 661244442217.

661244442166 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7934671 + ... + 8017573.

Almost surely, 2^661244442166 is an apocalyptic number.

661244442166 is a deficient number, since it is larger than the sum of its proper divisors (609431134922).

661244442166 is a wasteful number, since it uses less digits than its factorization.

661244442166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83095 (or 83074 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 46.

The spelling of 661244442166 in words is "six hundred sixty-one billion, two hundred forty-four million, four hundred forty-two thousand, one hundred sixty-six".