661410416077 has 2 divisors, whose sum is σ = 661410416078. Its totient is φ = 661410416076.

The previous prime is 661410416057. The next prime is 661410416137. The reversal of 661410416077 is 770614014166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562041093636 + 99369322441 = 749694^2 + 315229^2 .

It is a cyclic number.

It is not a de Polignac number, because 661410416077 - 2²³ = 661402027469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661410416057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330705208038 + 330705208039.

It is an arithmetic number, because the mean of its divisors is an integer number (330705208039).

Almost surely, 2^661410416077 is an apocalyptic number.

It is an amenable number.

661410416077 is a deficient number, since it is larger than the sum of its proper divisors (1).

661410416077 is an equidigital number, since it uses as much as digits as its factorization.

661410416077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 661410416077 in words is "six hundred sixty-one billion, four hundred ten million, four hundred sixteen thousand, seventy-seven".