16557427 has 4 divisors (see below), whose sum is σ = 16709440. Its totient is φ = 16405416.

The previous prime is 16557419. The next prime is 16557433. The reversal of 16557427 is 72475561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72475561 = 6367 ⋅11383.

It is a cyclic number.

It is not a de Polignac number, because 16557427 - 2³ = 16557419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16558427) 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, 75843 + ... + 76060.

It is an arithmetic number, because the mean of its divisors is an integer number (4177360).

Almost surely, 2^16557427 is an apocalyptic number.

16557427 is a deficient number, since it is larger than the sum of its proper divisors (152013).

16557427 is a wasteful number, since it uses less digits than its factorization.

16557427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152012.

The product of its digits is 58800, while the sum is 37.

The square root of 16557427 is about 4069.0818374665. The cubic root of 16557427 is about 254.8771778116.

The spelling of 16557427 in words is "sixteen million, five hundred fifty-seven thousand, four hundred twenty-seven".