664574653 has 4 divisors (see below), whose sum is σ = 664629340. Its totient is φ = 664519968.

The previous prime is 664574641. The next prime is 664574681. The reversal of 664574653 is 356475466.

664574653 is a nontrivial binomial coefficient, being equal to C(36458, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 611968644 + 52606009 = 24738^2 + 7253^2 .

It is a 3-Lehmer number, since φ(664574653) divides (664574653-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664574653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664571653) 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, 1 + ... + 36457.

It is an arithmetic number, because the mean of its divisors is an integer number (166157335).

It is a Poulet number, since it divides 2^664574652-1.

Almost surely, 2^664574653 is an apocalyptic number.

664574653 is the 36457-th triangular number and also the 18229-th hexagonal number.

664574653 is the 12153-rd centered nonagonal number.

It is an amenable number.

664574653 is a deficient number, since it is larger than the sum of its proper divisors (54687).

664574653 is a wasteful number, since it uses less digits than its factorization.

664574653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54686.

The product of its digits is 1814400, while the sum is 46.

The square root of 664574653 is about 25779.3454726841. The cubic root of 664574653 is about 872.6657361201.

The spelling of 664574653 in words is "six hundred sixty-four million, five hundred seventy-four thousand, six hundred fifty-three".