16501534440 has 32 divisors (see below), whose sum is σ = 49504603680. Its totient is φ = 4400409152.

The previous prime is 16501534363. The next prime is 16501534463. The reversal of 16501534440 is 4443510561.

It is a super-2 number, since 2×16501534440² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68756274 + ... + 68756513.

It is an arithmetic number, because the mean of its divisors is an integer number (1547018865).

Almost surely, 2^16501534440 is an apocalyptic number.

16501534440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16501534440 is an abundant number, since it is smaller than the sum of its proper divisors (33003069240).

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

16501534440 is a wasteful number, since it uses less digits than its factorization.

16501534440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137512801 (or 137512797 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 16501534440 in words is "sixteen billion, five hundred one million, five hundred thirty-four thousand, four hundred forty".