66364641 has 12 divisors (see below), whose sum is σ = 109554432. Its totient is φ = 37922616.

The previous prime is 66364621. The next prime is 66364657. The reversal of 66364641 is 14646366.

66364641 is a `hidden beast` number, since 6 + 6 + 3 + 6 + 4 + 641 = 666.

It is not a de Polignac number, because 66364641 - 2¹⁵ = 66331873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66364596 and 66364605.

It is not an unprimeable number, because it can be changed into a prime (66364621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 526641 + ... + 526766.

It is an arithmetic number, because the mean of its divisors is an integer number (9129536).

Almost surely, 2^66364641 is an apocalyptic number.

It is an amenable number.

66364641 is a deficient number, since it is larger than the sum of its proper divisors (43189791).

66364641 is a wasteful number, since it uses less digits than its factorization.

66364641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053420 (or 1053417 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 66364641 is about 8146.4495947621. The cubic root of 66364641 is about 404.8668789739.

The spelling of 66364641 in words is "sixty-six million, three hundred sixty-four thousand, six hundred forty-one".