66164451 has 4 divisors (see below), whose sum is σ = 88219272. Its totient is φ = 44109632.

The previous prime is 66164437. The next prime is 66164489. The reversal of 66164451 is 15446166.

It is a happy number.

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 66164451 - 2⁶ = 66164387 is a prime.

It is a super-2 number, since 2×66164451² = 8755469152262802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66164411) 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, 11027406 + ... + 11027411.

It is an arithmetic number, because the mean of its divisors is an integer number (22054818).

Almost surely, 2^66164451 is an apocalyptic number.

66164451 is a deficient number, since it is larger than the sum of its proper divisors (22054821).

66164451 is a wasteful number, since it uses less digits than its factorization.

66164451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22054820.

The product of its digits is 17280, while the sum is 33.

The square root of 66164451 is about 8134.1533671305. The cubic root of 66164451 is about 404.4593731463.

The spelling of 66164451 in words is "sixty-six million, one hundred sixty-four thousand, four hundred fifty-one".