665757404663 has 24 divisors (see below), whose sum is σ = 737874200448. Its totient is φ = 600090839712.

The previous prime is 665757404659. The next prime is 665757404671. The reversal of 665757404663 is 366404757566.

It is not a de Polignac number, because 665757404663 - 2² = 665757404659 is a prime.

It is a super-2 number, since 2×665757404663² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665757404693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32742206 + ... + 32762532.

It is an arithmetic number, because the mean of its divisors is an integer number (30744758352).

Almost surely, 2^665757404663 is an apocalyptic number.

665757404663 is a deficient number, since it is larger than the sum of its proper divisors (72116795785).

665757404663 is a wasteful number, since it uses less digits than its factorization.

665757404663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24903 (or 24890 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 59.

The spelling of 665757404663 in words is "six hundred sixty-five billion, seven hundred fifty-seven million, four hundred four thousand, six hundred sixty-three".