16775551 has 4 divisors (see below), whose sum is σ = 18065992. Its totient is φ = 15485112.

The previous prime is 16775531. The next prime is 16775573. The reversal of 16775551 is 15557761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16775551 - 2¹¹ = 16773503 is a prime.

It is a super-2 number, since 2×16775551² = 562838222707202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16775551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16775531) 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, 645201 + ... + 645226.

It is an arithmetic number, because the mean of its divisors is an integer number (4516498).

Almost surely, 2^16775551 is an apocalyptic number.

16775551 is a deficient number, since it is larger than the sum of its proper divisors (1290441).

16775551 is a wasteful number, since it uses less digits than its factorization.

16775551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290440.

The product of its digits is 36750, while the sum is 37.

The square root of 16775551 is about 4095.7967478868. The cubic root of 16775551 is about 255.9915310919.

The spelling of 16775551 in words is "sixteen million, seven hundred seventy-five thousand, five hundred fifty-one".