666254160 has 400 divisors, whose sum is σ = 2722325760. Its totient is φ = 148884480.

The previous prime is 666254159. The next prime is 666254167. The reversal of 666254160 is 61452666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666254167) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 926281 + ... + 926999.

Almost surely, 2^666254160 is an apocalyptic number.

666254160 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 666254160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361162880).

666254160 is an abundant number, since it is smaller than the sum of its proper divisors (2056071600).

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

666254160 is a wasteful number, since it uses less digits than its factorization.

666254160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 666254160 is about 25811.8995813946. The cubic root of 666254160 is about 873.4002486782.

The spelling of 666254160 in words is "six hundred sixty-six million, two hundred fifty-four thousand, one hundred sixty".