665660470757 has 2 divisors, whose sum is σ = 665660470758. Its totient is φ = 665660470756.

The previous prime is 665660470711. The next prime is 665660470759. The reversal of 665660470757 is 757074066566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 659451188356 + 6209282401 = 812066^2 + 78799^2 .

It is a cyclic number.

It is not a de Polignac number, because 665660470757 - 2¹² = 665660466661 is a prime.

Together with 665660470759, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665660470696 and 665660470705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665660470759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332830235378 + 332830235379.

It is an arithmetic number, because the mean of its divisors is an integer number (332830235379).

Almost surely, 2^665660470757 is an apocalyptic number.

It is an amenable number.

665660470757 is a deficient number, since it is larger than the sum of its proper divisors (1).

665660470757 is an equidigital number, since it uses as much as digits as its factorization.

665660470757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44452800, while the sum is 59.

The spelling of 665660470757 in words is "six hundred sixty-five billion, six hundred sixty million, four hundred seventy thousand, seven hundred fifty-seven".