64866643 has 4 divisors (see below), whose sum is σ = 64905280. Its totient is φ = 64828008.

The previous prime is 64866631. The next prime is 64866667. The reversal of 64866643 is 34666846.

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

It is a cyclic number.

It is not a de Polignac number, because 64866643 - 2¹⁷ = 64735571 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64866643.

It is not an unprimeable number, because it can be changed into a prime (64866673) 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, 16680 + ... + 20197.

It is an arithmetic number, because the mean of its divisors is an integer number (16226320).

Almost surely, 2^64866643 is an apocalyptic number.

64866643 is a deficient number, since it is larger than the sum of its proper divisors (38637).

64866643 is a wasteful number, since it uses less digits than its factorization.

64866643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38636.

The product of its digits is 497664, while the sum is 43.

The square root of 64866643 is about 8053.9830518818. The cubic root of 64866643 is about 401.7974173791.

The spelling of 64866643 in words is "sixty-four million, eight hundred sixty-six thousand, six hundred forty-three".