16631590645 has 8 divisors (see below), whose sum is σ = 20182155480. Its totient is φ = 13155774720.

The previous prime is 16631590643. The next prime is 16631590667. The reversal of 16631590645 is 54609513661.

It can be written as a sum of positive squares in 4 ways, for example, as 1022336676 + 15609253969 = 31974^2 + 124937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16631590645 - 2¹ = 16631590643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16631590595 and 16631590604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631590643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18686736 + ... + 18687625.

It is an arithmetic number, because the mean of its divisors is an integer number (2522769435).

Almost surely, 2^16631590645 is an apocalyptic number.

It is an amenable number.

16631590645 is a deficient number, since it is larger than the sum of its proper divisors (3550564835).

16631590645 is an equidigital number, since it uses as much as digits as its factorization.

16631590645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37374455.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 16631590645 in words is "sixteen billion, six hundred thirty-one million, five hundred ninety thousand, six hundred forty-five".