25305561040 has 20 divisors (see below), whose sum is σ = 58835429604. Its totient is φ = 10122224384.

The previous prime is 25305561031. The next prime is 25305561053. The reversal of 25305561040 is 4016550352.

It can be written as a sum of positive squares in 2 ways, for example, as 14906456464 + 10399104576 = 122092^2 + 101976^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 25305560993 and 25305561011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158159677 + ... + 158159836.

Almost surely, 2^25305561040 is an apocalyptic number.

25305561040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25305561040 is an abundant number, since it is smaller than the sum of its proper divisors (33529868564).

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

25305561040 is a wasteful number, since it uses less digits than its factorization.

25305561040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316319526 (or 316319520 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 25305561040 in words is "twenty-five billion, three hundred five million, five hundred sixty-one thousand, forty".