666562513 has 4 divisors (see below), whose sum is σ = 666620928. Its totient is φ = 666504100.

The previous prime is 666562499. The next prime is 666562597. The reversal of 666562513 is 315265666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 666562513 - 2²⁵ = 633008081 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666562213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5881 + ... + 36982.

It is an arithmetic number, because the mean of its divisors is an integer number (166655232).

Almost surely, 2^666562513 is an apocalyptic number.

It is an amenable number.

666562513 is a deficient number, since it is larger than the sum of its proper divisors (58415).

666562513 is a wasteful number, since it uses less digits than its factorization.

666562513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58414.

The product of its digits is 194400, while the sum is 40.

The square root of 666562513 is about 25817.8719688513. The cubic root of 666562513 is about 873.5349690627.

It can be divided in two parts, 66656 and 2513, that added together give a square (69169 = 263²).

The spelling of 666562513 in words is "six hundred sixty-six million, five hundred sixty-two thousand, five hundred thirteen".