64645811 has 4 divisors (see below), whose sum is σ = 64886400. Its totient is φ = 64405224.

The previous prime is 64645793. The next prime is 64645837. The reversal of 64645811 is 11854646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11854646 = 2 ⋅5927323.

It is a cyclic number.

It is not a de Polignac number, because 64645811 - 2¹⁸ = 64383667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64675811) 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, 119891 + ... + 120428.

It is an arithmetic number, because the mean of its divisors is an integer number (16221600).

Almost surely, 2^64645811 is an apocalyptic number.

64645811 is a deficient number, since it is larger than the sum of its proper divisors (240589).

64645811 is a wasteful number, since it uses less digits than its factorization.

64645811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240588.

The product of its digits is 23040, while the sum is 35.

The square root of 64645811 is about 8040.2618738447. The cubic root of 64645811 is about 401.3409392648.

It can be divided in two parts, 64645 and 811, that added together give a palindrome (65456).

The spelling of 64645811 in words is "sixty-four million, six hundred forty-five thousand, eight hundred eleven".