25211664166 has 16 divisors (see below), whose sum is σ = 40732524000. Its totient is φ = 11634441408.

The previous prime is 25211664143. The next prime is 25211664169. The reversal of 25211664166 is 66146611252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25211664169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118410 + ... + 253858.

It is an arithmetic number, because the mean of its divisors is an integer number (2545782750).

Almost surely, 2^25211664166 is an apocalyptic number.

25211664166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25211664166 is a deficient number, since it is larger than the sum of its proper divisors (15520859834).

25211664166 is a wasteful number, since it uses less digits than its factorization.

25211664166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142623.

The product of its digits is 103680, while the sum is 40.

The spelling of 25211664166 in words is "twenty-five billion, two hundred eleven million, six hundred sixty-four thousand, one hundred sixty-six".