64885511 has 4 divisors (see below), whose sum is σ = 66978624. Its totient is φ = 62792400.

The previous prime is 64885463. The next prime is 64885523. The reversal of 64885511 is 11558846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64885511 is a prime.

It is a super-2 number, since 2×64885511² = 8420259075462242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64885111) 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, 1046510 + ... + 1046571.

It is an arithmetic number, because the mean of its divisors is an integer number (16744656).

Almost surely, 2^64885511 is an apocalyptic number.

64885511 is a deficient number, since it is larger than the sum of its proper divisors (2093113).

64885511 is a wasteful number, since it uses less digits than its factorization.

64885511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093112.

The product of its digits is 38400, while the sum is 38.

The square root of 64885511 is about 8055.1543126125. The cubic root of 64885511 is about 401.8363710354.

The spelling of 64885511 in words is "sixty-four million, eight hundred eighty-five thousand, five hundred eleven".