66398160 has 80 divisors (see below), whose sum is σ = 216682560. Its totient is φ = 16773120.

The previous prime is 66398153. The next prime is 66398161. The reversal of 66398160 is 6189366.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66398161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2721 + ... + 11840.

It is an arithmetic number, because the mean of its divisors is an integer number (2708532).

Almost surely, 2^66398160 is an apocalyptic number.

66398160 is a gapful number since it is divisible by the number (60) 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 66398160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108341280).

66398160 is an abundant number, since it is smaller than the sum of its proper divisors (150284400).

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

66398160 is a wasteful number, since it uses less digits than its factorization.

66398160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14596 (or 14590 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 66398160 is about 8148.5066116436. The cubic root of 66398160 is about 404.9350299683.

The spelling of 66398160 in words is "sixty-six million, three hundred ninety-eight thousand, one hundred sixty".