25123513450 has 48 divisors (see below), whose sum is σ = 55246999680. Its totient is φ = 8316745920.

The previous prime is 25123513447. The next prime is 25123513453. The reversal of 25123513450 is 5431532152.

It is an interprime number because it is at equal distance from previous prime (25123513447) and next prime (25123513453).

It is not an unprimeable number, because it can be changed into a prime (25123513453) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1227462 + ... + 1247761.

It is an arithmetic number, because the mean of its divisors is an integer number (1150979160).

Almost surely, 2^25123513450 is an apocalyptic number.

25123513450 is an abundant number, since it is smaller than the sum of its proper divisors (30123486230).

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

25123513450 is a wasteful number, since it uses less digits than its factorization.

25123513450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475271 (or 2475266 counting only the distinct ones).

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

The spelling of 25123513450 in words is "twenty-five billion, one hundred twenty-three million, five hundred thirteen thousand, four hundred fifty".