660451885061 has 2 divisors, whose sum is σ = 660451885062. Its totient is φ = 660451885060.

The previous prime is 660451884979. The next prime is 660451885087. The reversal of 660451885061 is 160588154066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388479204961 + 271972680100 = 623281^2 + 521510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660451885061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660451885661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330225942530 + 330225942531.

It is an arithmetic number, because the mean of its divisors is an integer number (330225942531).

Almost surely, 2^660451885061 is an apocalyptic number.

It is an amenable number.

660451885061 is a deficient number, since it is larger than the sum of its proper divisors (1).

660451885061 is an equidigital number, since it uses as much as digits as its factorization.

660451885061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 660451885061 in words is "six hundred sixty billion, four hundred fifty-one million, eight hundred eighty-five thousand, sixty-one".