661650010060 has 96 divisors (see below), whose sum is σ = 1576024208640. Its totient is φ = 231308068608.

The previous prime is 661650010039. The next prime is 661650010069. The reversal of 661650010060 is 60010056166.

It is not an unprimeable number, because it can be changed into a prime (661650010069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8591847 + ... + 8668513.

It is an arithmetic number, because the mean of its divisors is an integer number (16416918840).

Almost surely, 2^661650010060 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661650010060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788012104320).

661650010060 is an abundant number, since it is smaller than the sum of its proper divisors (914374198580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661650010060 is a wasteful number, since it uses less digits than its factorization.

661650010060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78455 (or 78453 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 661650010060 in words is "six hundred sixty-one billion, six hundred fifty million, ten thousand, sixty".