25705540266 has 64 divisors (see below), whose sum is σ = 60520728576. Its totient is φ = 7126056000.

The previous prime is 25705540213. The next prime is 25705540303. The reversal of 25705540266 is 66204550752.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225576 + ... + 319836.

It is an arithmetic number, because the mean of its divisors is an integer number (945636384).

Almost surely, 2^25705540266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25705540266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30260364288).

25705540266 is an abundant number, since it is smaller than the sum of its proper divisors (34815188310).

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

25705540266 is a wasteful number, since it uses less digits than its factorization.

25705540266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94467.

The product of its (nonzero) digits is 504000, while the sum is 42.

The spelling of 25705540266 in words is "twenty-five billion, seven hundred five million, five hundred forty thousand, two hundred sixty-six".