25251025540 has 24 divisors (see below), whose sum is σ = 57106166040. Its totient is φ = 9323455488.

The previous prime is 25251025487. The next prime is 25251025559. The reversal of 25251025540 is 4552015252.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1766689024 + 23484336516 = 42032^2 + 153246^2 .

It is a super-2 number, since 2×25251025540² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48559405 + ... + 48559924.

It is an arithmetic number, because the mean of its divisors is an integer number (2379423585).

Almost surely, 2^25251025540 is an apocalyptic number.

25251025540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25251025540 is an abundant number, since it is smaller than the sum of its proper divisors (31855140500).

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

25251025540 is a wasteful number, since it uses less digits than its factorization.

25251025540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97119351 (or 97119349 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 31.

The spelling of 25251025540 in words is "twenty-five billion, two hundred fifty-one million, twenty-five thousand, five hundred forty".