661094889704 has 8 divisors (see below), whose sum is σ = 1239552918210. Its totient is φ = 330547444848.

The previous prime is 661094889673. The next prime is 661094889743. The reversal of 661094889704 is 407988490166.

It can be written as a sum of positive squares in only one way, i.e., 510238776100 + 150856113604 = 714310^2 + 388402^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41318430599 + ... + 41318430614.

Almost surely, 2^661094889704 is an apocalyptic number.

It is an amenable number.

661094889704 is a deficient number, since it is larger than the sum of its proper divisors (578458028506).

661094889704 is a wasteful number, since it uses less digits than its factorization.

661094889704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82636861219 (or 82636861215 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 62.

The spelling of 661094889704 in words is "six hundred sixty-one billion, ninety-four million, eight hundred eighty-nine thousand, seven hundred four".