65623513 has 4 divisors (see below), whose sum is σ = 65662948. Its totient is φ = 65584080.

The previous prime is 65623499. The next prime is 65623529. The reversal of 65623513 is 31532656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3087049 + 62536464 = 1757^2 + 7908^2 .

It is a cyclic number.

It is not a de Polignac number, because 65623513 - 2²¹ = 63526361 is a prime.

It is a super-2 number, since 2×65623513² = 8612890916922338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65623813) 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, 17106 + ... + 20587.

It is an arithmetic number, because the mean of its divisors is an integer number (16415737).

Almost surely, 2^65623513 is an apocalyptic number.

It is an amenable number.

65623513 is a deficient number, since it is larger than the sum of its proper divisors (39435).

65623513 is a wasteful number, since it uses less digits than its factorization.

65623513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39434.

The product of its digits is 16200, while the sum is 31.

The square root of 65623513 is about 8100.8340928574. The cubic root of 65623513 is about 403.3541149201.

The spelling of 65623513 in words is "sixty-five million, six hundred twenty-three thousand, five hundred thirteen".