64669145 has 4 divisors (see below), whose sum is σ = 77602980. Its totient is φ = 51735312.

The previous prime is 64669097. The next prime is 64669147. The reversal of 64669145 is 54196646.

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 26822041 + 37847104 = 5179^2 + 6152^2 .

It is a cyclic number.

It is not a de Polignac number, because 64669145 - 2⁸ = 64668889 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64669147) 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, 6466910 + ... + 6466919.

It is an arithmetic number, because the mean of its divisors is an integer number (19400745).

Almost surely, 2^64669145 is an apocalyptic number.

It is an amenable number.

64669145 is a deficient number, since it is larger than the sum of its proper divisors (12933835).

64669145 is a wasteful number, since it uses less digits than its factorization.

64669145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12933834.

The product of its digits is 155520, while the sum is 41.

The square root of 64669145 is about 8041.7128150662. The cubic root of 64669145 is about 401.3892216557.

The spelling of 64669145 in words is "sixty-four million, six hundred sixty-nine thousand, one hundred forty-five".