66164261 has 16 divisors (see below), whose sum is σ = 72327168. Its totient is φ = 60337200.

The previous prime is 66164257. The next prime is 66164269. The reversal of 66164261 is 16246166.

It is a cyclic number.

It is not a de Polignac number, because 66164261 - 2² = 66164257 is a prime.

It is a super-2 number, since 2×66164261² = 8755418867352242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66164269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49970 + ... + 51276.

It is an arithmetic number, because the mean of its divisors is an integer number (4520448).

Almost surely, 2^66164261 is an apocalyptic number.

It is an amenable number.

66164261 is a deficient number, since it is larger than the sum of its proper divisors (6162907).

66164261 is a wasteful number, since it uses less digits than its factorization.

66164261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its digits is 10368, while the sum is 32.

The square root of 66164261 is about 8134.1416879718. The cubic root of 66164261 is about 404.4589859930.

The spelling of 66164261 in words is "sixty-six million, one hundred sixty-four thousand, two hundred sixty-one".