64655861 has 4 divisors (see below), whose sum is σ = 64673952. Its totient is φ = 64637772.

The previous prime is 64655839. The next prime is 64655867. The reversal of 64655861 is 16855646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64655861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64655867) 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, 1691 + ... + 11496.

It is an arithmetic number, because the mean of its divisors is an integer number (16168488).

Almost surely, 2^64655861 is an apocalyptic number.

It is an amenable number.

64655861 is a deficient number, since it is larger than the sum of its proper divisors (18091).

64655861 is a wasteful number, since it uses less digits than its factorization.

64655861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090.

The product of its digits is 172800, while the sum is 41.

The square root of 64655861 is about 8040.8868291999. The cubic root of 64655861 is about 401.3617360103.

The spelling of 64655861 in words is "sixty-four million, six hundred fifty-five thousand, eight hundred sixty-one".