25194865940 has 24 divisors (see below), whose sum is σ = 53264320200. Its totient is φ = 10010307968.

The previous prime is 25194865933. The next prime is 25194865981. The reversal of 25194865940 is 4956849152.

It can be written as a sum of positive squares in 4 ways, for example, as 104939536 + 25089926404 = 10244^2 + 158398^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4224347 + ... + 4230306.

It is an arithmetic number, because the mean of its divisors is an integer number (2219346675).

Almost surely, 2^25194865940 is an apocalyptic number.

25194865940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25194865940 is an abundant number, since it is smaller than the sum of its proper divisors (28069454260).

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

25194865940 is a wasteful number, since it uses less digits than its factorization.

25194865940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8454811 (or 8454809 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 25194865940 in words is "twenty-five billion, one hundred ninety-four million, eight hundred sixty-five thousand, nine hundred forty".