816609492000 has 768 divisors, whose sum is σ = 3100678963200. Its totient is φ = 208496332800.

The previous prime is 816609491947. The next prime is 816609492001. The reversal of 816609492000 is 294906618.

It is a happy number.

816609492000 is a `hidden beast` number, since 8 + 16 + 609 + 4 + 9 + 20 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (816609492001) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 397762974 + ... + 397765026.

It is an arithmetic number, because the mean of its divisors is an integer number (4037342400).

Almost surely, 2^816609492000 is an apocalyptic number.

816609492000 is a gapful number since it is divisible by the number (80) 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 816609492000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1550339481600).

816609492000 is an abundant number, since it is smaller than the sum of its proper divisors (2284069471200).

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

816609492000 is a wasteful number, since it uses less digits than its factorization.

816609492000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243 (or 2219 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 816609492000 in words is "eight hundred sixteen billion, six hundred nine million, four hundred ninety-two thousand".