16604434440 has 96 divisors (see below), whose sum is σ = 58870281600. Its totient is φ = 4025316480.

The previous prime is 16604434409. The next prime is 16604434471. The reversal of 16604434440 is 4443440661.

16604434440 is a `hidden beast` number, since 1 + 6 + 604 + 4 + 3 + 4 + 4 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (16604434409) and next prime (16604434471).

It is a super-2 number, since 2×16604434440² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16604434395 and 16604434404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2092560 + ... + 2100479.

It is an arithmetic number, because the mean of its divisors is an integer number (613232100).

Almost surely, 2^16604434440 is an apocalyptic number.

16604434440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16604434440 is an abundant number, since it is smaller than the sum of its proper divisors (42265847160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16604434440 is a wasteful number, since it uses less digits than its factorization.

16604434440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193067 (or 4193060 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 16604434440 in words is "sixteen billion, six hundred four million, four hundred thirty-four thousand, four hundred forty".