25506540850 has 36 divisors (see below), whose sum is σ = 55187831034. Its totient is φ = 8745098880.

The previous prime is 25506540841. The next prime is 25506540877. The reversal of 25506540850 is 5804560552.

25506540850 = T₄₅₀ + T₄₅₁ + ... + T₅₃₄₉.

It can be written as a sum of positive squares in 3 ways, for example, as 24606000769 + 900540081 = 156863^2 + 30009^2 .

It is a super-2 number, since 2×25506540850² (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 17 ways as a sum of consecutive naturals, for example, 5202967 + ... + 5207866.

Almost surely, 2^25506540850 is an apocalyptic number.

25506540850 is an abundant number, since it is smaller than the sum of its proper divisors (29681290184).

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

25506540850 is a wasteful number, since it uses less digits than its factorization.

25506540850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10410859 (or 10410847 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 25506540850 in words is "twenty-five billion, five hundred six million, five hundred forty thousand, eight hundred fifty".