64867553 has 4 divisors (see below), whose sum is σ = 65509908. Its totient is φ = 64225200.

The previous prime is 64867513. The next prime is 64867589. The reversal of 64867553 is 35576846.

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 46403344 + 18464209 = 6812^2 + 4297^2 .

It is a cyclic number.

It is not a de Polignac number, because 64867553 - 2²⁰ = 63818977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64867513) 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, 321026 + ... + 321227.

It is an arithmetic number, because the mean of its divisors is an integer number (16377477).

Almost surely, 2^64867553 is an apocalyptic number.

It is an amenable number.

64867553 is a deficient number, since it is larger than the sum of its proper divisors (642355).

64867553 is a wasteful number, since it uses less digits than its factorization.

64867553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642354.

The product of its digits is 604800, while the sum is 44.

The square root of 64867553 is about 8054.0395454703. The cubic root of 64867553 is about 401.7992962798.

The spelling of 64867553 in words is "sixty-four million, eight hundred sixty-seven thousand, five hundred fifty-three".