25250556666 has 32 divisors (see below), whose sum is σ = 52277995008. Its totient is φ = 8122245120.

The previous prime is 25250556619. The next prime is 25250556691. The reversal of 25250556666 is 66665505252.

It is a super-2 number, since 2×25250556666² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126631 + ... + 257946.

It is an arithmetic number, because the mean of its divisors is an integer number (1633687344).

Almost surely, 2^25250556666 is an apocalyptic number.

25250556666 is an abundant number, since it is smaller than the sum of its proper divisors (27027438342).

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

25250556666 is a wasteful number, since it uses less digits than its factorization.

25250556666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384966.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 25250556666 in words is "twenty-five billion, two hundred fifty million, five hundred fifty-six thousand, six hundred sixty-six".