16440612500 has 72 divisors (see below), whose sum is σ = 38728193112. Its totient is φ = 6070320000.

The previous prime is 16440612473. The next prime is 16440612521. The reversal of 16440612500 is 521604461.

It can be written as a sum of positive squares in 12 ways, for example, as 15703598596 + 737013904 = 125314^2 + 27148^2 .

It is a super-3 number, since 3×16440612500³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

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, 111914 + ... + 213086.

It is an arithmetic number, because the mean of its divisors is an integer number (537891571).

Almost surely, 2^16440612500 is an apocalyptic number.

16440612500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16440612500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19364096556).

16440612500 is an abundant number, since it is smaller than the sum of its proper divisors (22287580612).

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

16440612500 is a wasteful number, since it uses less digits than its factorization.

16440612500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101215 (or 101193 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 16440612500 in words is "sixteen billion, four hundred forty million, six hundred twelve thousand, five hundred".