25145051866 has 48 divisors (see below), whose sum is σ = 45410780520. Its totient is φ = 10386252800.

The previous prime is 25145051861. The next prime is 25145051881. The reversal of 25145051866 is 66815054152.

It can be written as a sum of positive squares in 4 ways, for example, as 24725990025 + 419061841 = 157245^2 + 20471^2 .

It is not an unprimeable number, because it can be changed into a prime (25145051861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13926 + ... + 224686.

Almost surely, 2^25145051866 is an apocalyptic number.

25145051866 is a deficient number, since it is larger than the sum of its proper divisors (20265728654).

25145051866 is a wasteful number, since it uses less digits than its factorization.

25145051866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210831 (or 210820 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 43.

The spelling of 25145051866 in words is "twenty-five billion, one hundred forty-five million, fifty-one thousand, eight hundred sixty-six".