661311216004 has 12 divisors (see below), whose sum is σ = 1162484291584. Its totient is φ = 329172846984.

The previous prime is 661311215953. The next prime is 661311216011. The reversal of 661311216004 is 400612113166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370689252 + ... + 370691035.

Almost surely, 2^661311216004 is an apocalyptic number.

It is an amenable number.

661311216004 is a deficient number, since it is larger than the sum of its proper divisors (501173075580).

661311216004 is a wasteful number, since it uses less digits than its factorization.

661311216004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741380514 (or 741380512 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 661311216004 in words is "six hundred sixty-one billion, three hundred eleven million, two hundred sixteen thousand, four".