666565410 has 256 divisors, whose sum is σ = 2110095360. Its totient is φ = 131051520.

The previous prime is 666565373. The next prime is 666565433. The reversal of 666565410 is 14565666.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2102572 + ... + 2102888.

It is an arithmetic number, because the mean of its divisors is an integer number (8242560).

Almost surely, 2^666565410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666565410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055047680).

666565410 is an abundant number, since it is smaller than the sum of its proper divisors (1443529950).

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

666565410 is a wasteful number, since it uses less digits than its factorization.

666565410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 666565410 is about 25817.9280733369. The cubic root of 666565410 is about 873.5362345740.

The spelling of 666565410 in words is "six hundred sixty-six million, five hundred sixty-five thousand, four hundred ten".