665874478487 has 2 divisors, whose sum is σ = 665874478488. Its totient is φ = 665874478486.

The previous prime is 665874478453. The next prime is 665874478579. The reversal of 665874478487 is 784874478566.

665874478487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665874478487 - 2¹⁴ = 665874462103 is a prime.

It is a super-2 number, since 2×665874478487² (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 (665874478987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332937239243 + 332937239244.

It is an arithmetic number, because the mean of its divisors is an integer number (332937239244).

Almost surely, 2^665874478487 is an apocalyptic number.

665874478487 is a deficient number, since it is larger than the sum of its proper divisors (1).

665874478487 is an equidigital number, since it uses as much as digits as its factorization.

665874478487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2023096320, while the sum is 74.

The spelling of 665874478487 in words is "six hundred sixty-five billion, eight hundred seventy-four million, four hundred seventy-eight thousand, four hundred eighty-seven".