165853472400 has 1440 divisors, whose sum is σ = 760691312640. Its totient is φ = 33336576000.

The previous prime is 165853472357. The next prime is 165853472423. The reversal of 165853472400 is 4274358561.

165853472400 is a `hidden beast` number, since 1 + 6 + 5 + 8 + 534 + 72 + 40 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 2335964365 + ... + 2335964435.

It is an arithmetic number, because the mean of its divisors is an integer number (528257856).

Almost surely, 2^165853472400 is an apocalyptic number.

165853472400 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 165853472400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (380345656320).

165853472400 is an abundant number, since it is smaller than the sum of its proper divisors (594837840240).

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

165853472400 is a wasteful number, since it uses less digits than its factorization.

165853472400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 165853472400 in words is "one hundred sixty-five billion, eight hundred fifty-three million, four hundred seventy-two thousand, four hundred".