661130277701 has 2 divisors, whose sum is σ = 661130277702. Its totient is φ = 661130277700.

The previous prime is 661130277697. The next prime is 661130277713. The reversal of 661130277701 is 107772031166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660073377601 + 1056900100 = 812449^2 + 32510^2 .

It is a cyclic number.

It is not a de Polignac number, because 661130277701 - 2² = 661130277697 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661130277601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330565138850 + 330565138851.

It is an arithmetic number, because the mean of its divisors is an integer number (330565138851).

Almost surely, 2^661130277701 is an apocalyptic number.

It is an amenable number.

661130277701 is a deficient number, since it is larger than the sum of its proper divisors (1).

661130277701 is an equidigital number, since it uses as much as digits as its factorization.

661130277701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 41.

The spelling of 661130277701 in words is "six hundred sixty-one billion, one hundred thirty million, two hundred seventy-seven thousand, seven hundred one".