16631745667 has 4 divisors (see below), whose sum is σ = 16690933656. Its totient is φ = 16572557680.

The previous prime is 16631745607. The next prime is 16631745679. The reversal of 16631745667 is 76654713661.

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 16631745667 - 2¹⁵ = 16631712899 is a prime.

It is a super-2 number, since 2×16631745667² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16631745607) 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, 29593573 + ... + 29594134.

It is an arithmetic number, because the mean of its divisors is an integer number (4172733414).

Almost surely, 2^16631745667 is an apocalyptic number.

16631745667 is a deficient number, since it is larger than the sum of its proper divisors (59187989).

16631745667 is an equidigital number, since it uses as much as digits as its factorization.

16631745667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59187988.

The product of its digits is 3810240, while the sum is 52.

The spelling of 16631745667 in words is "sixteen billion, six hundred thirty-one million, seven hundred forty-five thousand, six hundred sixty-seven".