64669553 has 4 divisors (see below), whose sum is σ = 69644148. Its totient is φ = 59694960.

The previous prime is 64669523. The next prime is 64669589. The reversal of 64669553 is 35596646.

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 43665664 + 21003889 = 6608^2 + 4583^2 .

It is not a de Polignac number, because 64669553 - 2⁶ = 64669489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64669523) 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, 2487278 + ... + 2487303.

It is an arithmetic number, because the mean of its divisors is an integer number (17411037).

Almost surely, 2^64669553 is an apocalyptic number.

It is an amenable number.

64669553 is a deficient number, since it is larger than the sum of its proper divisors (4974595).

64669553 is a wasteful number, since it uses less digits than its factorization.

64669553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4974594.

The product of its digits is 583200, while the sum is 44.

The square root of 64669553 is about 8041.7381827563. The cubic root of 64669553 is about 401.3900657803.

The spelling of 64669553 in words is "sixty-four million, six hundred sixty-nine thousand, five hundred fifty-three".