661812927910 has 32 divisors (see below), whose sum is σ = 1261810680192. Its totient is φ = 249059650560.

The previous prime is 661812927883. The next prime is 661812927949. The reversal of 661812927910 is 19729218166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274687 + ... + 1182826.

It is an arithmetic number, because the mean of its divisors is an integer number (39431583756).

Almost surely, 2^661812927910 is an apocalyptic number.

661812927910 is a deficient number, since it is larger than the sum of its proper divisors (599997752282).

661812927910 is a wasteful number, since it uses less digits than its factorization.

661812927910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460208.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 661812927910 in words is "six hundred sixty-one billion, eight hundred twelve million, nine hundred twenty-seven thousand, nine hundred ten".