665461639607 has 2 divisors, whose sum is σ = 665461639608. Its totient is φ = 665461639606.

The previous prime is 665461639553. The next prime is 665461639643. The reversal of 665461639607 is 706936164566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665461639607 - 2⁶ = 665461639543 is a prime.

It is a super-2 number, since 2×665461639607² (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 (665461639907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332730819803 + 332730819804.

It is an arithmetic number, because the mean of its divisors is an integer number (332730819804).

Almost surely, 2^665461639607 is an apocalyptic number.

665461639607 is a deficient number, since it is larger than the sum of its proper divisors (1).

665461639607 is an equidigital number, since it uses as much as digits as its factorization.

665461639607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 59.

The spelling of 665461639607 in words is "six hundred sixty-five billion, four hundred sixty-one million, six hundred thirty-nine thousand, six hundred seven".