264720653 has 4 divisors (see below), whose sum is σ = 264753468. Its totient is φ = 264687840.

The previous prime is 264720649. The next prime is 264720661. The reversal of 264720653 is 356027462.

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 130462084 + 134258569 = 11422^2 + 11587^2 .

It is a cyclic number.

It is not a de Polignac number, because 264720653 - 2² = 264720649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264720353) 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, 5033 + ... + 23553.

It is an arithmetic number, because the mean of its divisors is an integer number (66188367).

Almost surely, 2^264720653 is an apocalyptic number.

It is an amenable number.

264720653 is a deficient number, since it is larger than the sum of its proper divisors (32815).

264720653 is a wasteful number, since it uses less digits than its factorization.

264720653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32814.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 264720653 is about 16270.2382588578. The cubic root of 264720653 is about 642.0900526493.

The spelling of 264720653 in words is "two hundred sixty-four million, seven hundred twenty thousand, six hundred fifty-three".