16564474 has 4 divisors (see below), whose sum is σ = 24846714. Its totient is φ = 8282236.

The previous prime is 16564469. The next prime is 16564501. The reversal of 16564474 is 47446561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47446561 = 59 ⋅804179.

It can be written as a sum of positive squares in only one way, i.e., 9579025 + 6985449 = 3095^2 + 2643^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4141117 + ... + 4141120.

Almost surely, 2^16564474 is an apocalyptic number.

16564474 is a deficient number, since it is larger than the sum of its proper divisors (8282240).

16564474 is an equidigital number, since it uses as much as digits as its factorization.

16564474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282239.

The product of its digits is 80640, while the sum is 37.

The square root of 16564474 is about 4069.9476655112. The cubic root of 16564474 is about 254.9133320748.

The spelling of 16564474 in words is "sixteen million, five hundred sixty-four thousand, four hundred seventy-four".