16431600645 has 24 divisors (see below), whose sum is σ = 28882593792. Its totient is φ = 8640088800.

The previous prime is 16431600643. The next prime is 16431600649. The reversal of 16431600645 is 54600613461.

It is a happy number.

16431600645 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 1 + 6 + 0 + 0 + 645 = 666.

It is not a de Polignac number, because 16431600645 - 2¹ = 16431600643 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16431600643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2568261 + ... + 2574650.

It is an arithmetic number, because the mean of its divisors is an integer number (1203441408).

Almost surely, 2^16431600645 is an apocalyptic number.

16431600645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16431600645 is a deficient number, since it is larger than the sum of its proper divisors (12450993147).

16431600645 is a wasteful number, since it uses less digits than its factorization.

16431600645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142993 (or 5142990 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 16431600645 in words is "sixteen billion, four hundred thirty-one million, six hundred thousand, six hundred forty-five".