16779957 has 4 divisors (see below), whose sum is σ = 22373280. Its totient is φ = 11186636.

The previous prime is 16779953. The next prime is 16779979. The reversal of 16779957 is 75997761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16779957 - 2² = 16779953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16779953) 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, 2796657 + ... + 2796662.

It is an arithmetic number, because the mean of its divisors is an integer number (5593320).

Almost surely, 2^16779957 is an apocalyptic number.

It is an amenable number.

16779957 is a deficient number, since it is larger than the sum of its proper divisors (5593323).

16779957 is an equidigital number, since it uses as much as digits as its factorization.

16779957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593322.

The product of its digits is 833490, while the sum is 51.

The square root of 16779957 is about 4096.3345810615. The cubic root of 16779957 is about 256.0139406878.

The spelling of 16779957 in words is "sixteen million, seven hundred seventy-nine thousand, nine hundred fifty-seven".