665148864931 has 2 divisors, whose sum is σ = 665148864932. Its totient is φ = 665148864930.

The previous prime is 665148864917. The next prime is 665148865141. The reversal of 665148864931 is 139468841566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665148864931 - 2¹³ = 665148856739 is a prime.

It is a super-2 number, since 2×665148864931² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665148864931.

It is not a weakly prime, because it can be changed into another prime (665128864931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332574432465 + 332574432466.

It is an arithmetic number, because the mean of its divisors is an integer number (332574432466).

Almost surely, 2^665148864931 is an apocalyptic number.

665148864931 is a deficient number, since it is larger than the sum of its proper divisors (1).

665148864931 is an equidigital number, since it uses as much as digits as its factorization.

665148864931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29859840, while the sum is 61.

The spelling of 665148864931 in words is "six hundred sixty-five billion, one hundred forty-eight million, eight hundred sixty-four thousand, nine hundred thirty-one".