64561507 has 4 divisors (see below), whose sum is σ = 65470896. Its totient is φ = 63652120.

The previous prime is 64561501. The next prime is 64561531. The reversal of 64561507 is 70516546.

It is a happy number.

64561507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70516546 = 2 ⋅35258273.

It is a cyclic number.

It is not a de Polignac number, because 64561507 - 2⁷ = 64561379 is a prime.

It is a super-2 number, since 2×64561507² = 8336376372222098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64561501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454588 + ... + 454729.

It is an arithmetic number, because the mean of its divisors is an integer number (16367724).

Almost surely, 2^64561507 is an apocalyptic number.

64561507 is a deficient number, since it is larger than the sum of its proper divisors (909389).

64561507 is an equidigital number, since it uses as much as digits as its factorization.

64561507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909388.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 64561507 is about 8035.0175482073. The cubic root of 64561507 is about 401.1664017116.

The spelling of 64561507 in words is "sixty-four million, five hundred sixty-one thousand, five hundred seven".