661740833311 has 2 divisors, whose sum is σ = 661740833312. Its totient is φ = 661740833310.

The previous prime is 661740833279. The next prime is 661740833321. The reversal of 661740833311 is 113338047166.

661740833311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661740833311 - 2⁵ = 661740833279 is a prime.

It is a super-2 number, since 2×661740833311² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661740833321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330870416655 + 330870416656.

It is an arithmetic number, because the mean of its divisors is an integer number (330870416656).

Almost surely, 2^661740833311 is an apocalyptic number.

661740833311 is a deficient number, since it is larger than the sum of its proper divisors (1).

661740833311 is an equidigital number, since it uses as much as digits as its factorization.

661740833311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 661740833311 in words is "six hundred sixty-one billion, seven hundred forty million, eight hundred thirty-three thousand, three hundred eleven".