661023316319 has 2 divisors, whose sum is σ = 661023316320. Its totient is φ = 661023316318.

The previous prime is 661023316307. The next prime is 661023316367. The reversal of 661023316319 is 913613320166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661023316319 - 2¹² = 661023312223 is a prime.

It is a super-2 number, since 2×661023316319² (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 (661023016319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330511658159 + 330511658160.

It is an arithmetic number, because the mean of its divisors is an integer number (330511658160).

Almost surely, 2^661023316319 is an apocalyptic number.

661023316319 is a deficient number, since it is larger than the sum of its proper divisors (1).

661023316319 is an equidigital number, since it uses as much as digits as its factorization.

661023316319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The spelling of 661023316319 in words is "six hundred sixty-one billion, twenty-three million, three hundred sixteen thousand, three hundred nineteen".