25561769940 has 96 divisors (see below), whose sum is σ = 90886306560. Its totient is φ = 5842689408.

The previous prime is 25561769929. The next prime is 25561769951. The reversal of 25561769940 is 4996716552.

25561769940 is a `hidden beast` number, since 2 + 5 + 561 + 76 + 9 + 9 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (25561769929) and next prime (25561769951).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 3377407 + ... + 3384966.

It is an arithmetic number, because the mean of its divisors is an integer number (946732360).

Almost surely, 2^25561769940 is an apocalyptic number.

25561769940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25561769940 is an abundant number, since it is smaller than the sum of its proper divisors (65324536620).

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

25561769940 is a wasteful number, since it uses less digits than its factorization.

25561769940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762398 (or 6762390 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 25561769940 in words is "twenty-five billion, five hundred sixty-one million, seven hundred sixty-nine thousand, nine hundred forty".