16664451 has 8 divisors (see below), whose sum is σ = 22361424. Its totient is φ = 11038560.

The previous prime is 16664447. The next prime is 16664477. The reversal of 16664451 is 15446661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16664451 - 2² = 16664447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16664411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17220 + ... + 18161.

It is an arithmetic number, because the mean of its divisors is an integer number (2795178).

Almost surely, 2^16664451 is an apocalyptic number.

16664451 is a deficient number, since it is larger than the sum of its proper divisors (5696973).

16664451 is a wasteful number, since it uses less digits than its factorization.

16664451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35541.

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

The square root of 16664451 is about 4082.2115329806. The cubic root of 16664451 is about 255.4251577211.

The spelling of 16664451 in words is "sixteen million, six hundred sixty-four thousand, four hundred fifty-one".