16696691 has 4 divisors (see below), whose sum is σ = 18214584. Its totient is φ = 15178800.

The previous prime is 16696681. The next prime is 16696699. The reversal of 16696691 is 19669661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19669661 = 11 ⋅1788151.

It is a cyclic number.

It is not a de Polignac number, because 16696691 - 2⁶ = 16696627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16696699) 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, 758930 + ... + 758951.

It is an arithmetic number, because the mean of its divisors is an integer number (4553646).

Almost surely, 2^16696691 is an apocalyptic number.

16696691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16696691 is a deficient number, since it is larger than the sum of its proper divisors (1517893).

16696691 is a wasteful number, since it uses less digits than its factorization.

16696691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517892.

The product of its digits is 104976, while the sum is 44.

The square root of 16696691 is about 4086.1584648665. The cubic root of 16696691 is about 255.5897716491.

The spelling of 16696691 in words is "sixteen million, six hundred ninety-six thousand, six hundred ninety-one".