16697641 has 4 divisors (see below), whose sum is σ = 16711552. Its totient is φ = 16683732.

The previous prime is 16697633. The next prime is 16697663. The reversal of 16697641 is 14679661.

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 16697641 - 2³ = 16697633 is a prime.

It is a super-2 number, since 2×16697641² = 557622429929762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16697594 and 16697603.

It is not an unprimeable number, because it can be changed into a prime (16697041) 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, 4965 + ... + 7618.

It is an arithmetic number, because the mean of its divisors is an integer number (4177888).

Almost surely, 2^16697641 is an apocalyptic number.

It is an amenable number.

16697641 is a deficient number, since it is larger than the sum of its proper divisors (13911).

16697641 is a wasteful number, since it uses less digits than its factorization.

16697641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13910.

The product of its digits is 54432, while the sum is 40.

The square root of 16697641 is about 4086.2747093165. The cubic root of 16697641 is about 255.5946190303.

The spelling of 16697641 in words is "sixteen million, six hundred ninety-seven thousand, six hundred forty-one".