16669642997 has 4 divisors (see below), whose sum is σ = 19051020576. Its totient is φ = 14288265420.

The previous prime is 16669642987. The next prime is 16669643083. The reversal of 16669642997 is 79924696661.

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 16669642997 - 2¹² = 16669638901 is a prime.

It is a super-2 number, since 2×16669642997² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16669642987) 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, 1190688779 + ... + 1190688792.

It is an arithmetic number, because the mean of its divisors is an integer number (4762755144).

Almost surely, 2^16669642997 is an apocalyptic number.

It is an amenable number.

16669642997 is a deficient number, since it is larger than the sum of its proper divisors (2381377579).

16669642997 is an equidigital number, since it uses as much as digits as its factorization.

16669642997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381377578.

The product of its digits is 52907904, while the sum is 65.

The spelling of 16669642997 in words is "sixteen billion, six hundred sixty-nine million, six hundred forty-two thousand, nine hundred ninety-seven".