16611992400 has 240 divisors, whose sum is σ = 54343396800. Its totient is φ = 4336865280.

The previous prime is 16611992399. The next prime is 16611992401. The reversal of 16611992400 is 429911661.

It is an interprime number because it is at equal distance from previous prime (16611992399) and next prime (16611992401).

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16611992401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11640487 + ... + 11641913.

It is an arithmetic number, because the mean of its divisors is an integer number (226430820).

Almost surely, 2^16611992400 is an apocalyptic number.

16611992400 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 16611992400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27171698400).

16611992400 is an abundant number, since it is smaller than the sum of its proper divisors (37731404400).

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

16611992400 is a wasteful number, since it uses less digits than its factorization.

16611992400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 16611992400 in words is "sixteen billion, six hundred eleven million, nine hundred ninety-two thousand, four hundred".