661185275411 has 2 divisors, whose sum is σ = 661185275412. Its totient is φ = 661185275410.

The previous prime is 661185275389. The next prime is 661185275459. The reversal of 661185275411 is 114572581166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661185275411 - 2³⁴ = 644005406227 is a prime.

It is not a weakly prime, because it can be changed into another prime (661185275011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330592637705 + 330592637706.

It is an arithmetic number, because the mean of its divisors is an integer number (330592637706).

Almost surely, 2^661185275411 is an apocalyptic number.

661185275411 is a deficient number, since it is larger than the sum of its proper divisors (1).

661185275411 is an equidigital number, since it uses as much as digits as its factorization.

661185275411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 47.

The spelling of 661185275411 in words is "six hundred sixty-one billion, one hundred eighty-five million, two hundred seventy-five thousand, four hundred eleven".