66214451 has 4 divisors (see below), whose sum is σ = 66313512. Its totient is φ = 66115392.

The previous prime is 66214441. The next prime is 66214469. The reversal of 66214451 is 15441266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15441266 = 2 ⋅7720633.

It is a cyclic number.

It is not a de Polignac number, because 66214451 - 2¹⁸ = 65952307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66214441) 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, 48521 + ... + 49866.

It is an arithmetic number, because the mean of its divisors is an integer number (16578378).

Almost surely, 2^66214451 is an apocalyptic number.

66214451 is a deficient number, since it is larger than the sum of its proper divisors (99061).

66214451 is an equidigital number, since it uses as much as digits as its factorization.

66214451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99060.

The product of its digits is 5760, while the sum is 29.

The square root of 66214451 is about 8137.2262473155. The cubic root of 66214451 is about 404.5612298401.

The spelling of 66214451 in words is "sixty-six million, two hundred fourteen thousand, four hundred fifty-one".