2585040666 has 16 divisors (see below), whose sum is σ = 5567780064. Its totient is φ = 795397104.

The previous prime is 2585040641. The next prime is 2585040671. The reversal of 2585040666 is 6660405852.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16570696 + ... + 16570851.

It is an arithmetic number, because the mean of its divisors is an integer number (347986254).

Almost surely, 2^2585040666 is an apocalyptic number.

2585040666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2585040666 is an abundant number, since it is smaller than the sum of its proper divisors (2982739398).

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

2585040666 is a wasteful number, since it uses less digits than its factorization.

2585040666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33141565.

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 2585040666 is about 50843.2951921883. The cubic root of 2585040666 is about 1372.4265989060.

The spelling of 2585040666 in words is "two billion, five hundred eighty-five million, forty thousand, six hundred sixty-six".