16775681 has 8 divisors (see below), whose sum is σ = 18649344. Its totient is φ = 14985360.

The previous prime is 16775669. The next prime is 16775687. The reversal of 16775681 is 18657761.

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

It is not a de Polignac number, because 16775681 - 2¹⁸ = 16513537 is a prime.

It is a super-2 number, since 2×16775681² = 562846946027522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16775687) 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, 20411 + ... + 21216.

It is an arithmetic number, because the mean of its divisors is an integer number (2331168).

Almost surely, 2^16775681 is an apocalyptic number.

It is an amenable number.

16775681 is a deficient number, since it is larger than the sum of its proper divisors (1873663).

16775681 is a wasteful number, since it uses less digits than its factorization.

16775681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41671.

The product of its digits is 70560, while the sum is 41.

The square root of 16775681 is about 4095.8126177842. The cubic root of 16775681 is about 255.9921923481.

The spelling of 16775681 in words is "sixteen million, seven hundred seventy-five thousand, six hundred eighty-one".