16305661631 has 4 divisors (see below), whose sum is σ = 18635041872. Its totient is φ = 13976281392.

The previous prime is 16305661613. The next prime is 16305661643. The reversal of 16305661631 is 13616650361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16305661631 is a prime.

It is a super-2 number, since 2×16305661631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16305661681) 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, 1164690110 + ... + 1164690123.

It is an arithmetic number, because the mean of its divisors is an integer number (4658760468).

Almost surely, 2^16305661631 is an apocalyptic number.

16305661631 is a deficient number, since it is larger than the sum of its proper divisors (2329380241).

16305661631 is an equidigital number, since it uses as much as digits as its factorization.

16305661631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329380240.

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 16305661631 in words is "sixteen billion, three hundred five million, six hundred sixty-one thousand, six hundred thirty-one".