25438424850 has 72 divisors (see below), whose sum is σ = 70549270272. Its totient is φ = 6564751200.

The previous prime is 25438424779. The next prime is 25438424857. The reversal of 25438424850 is 5842483452.

25438424850 is a `hidden beast` number, since 2 + 543 + 8 + 4 + 24 + 85 + 0 = 666.

It is a super-2 number, since 2×25438424850² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 25438424796 and 25438424805.

It is not an unprimeable number, because it can be changed into a prime (25438424857) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 897822 + ... + 925721.

It is an arithmetic number, because the mean of its divisors is an integer number (979850976).

Almost surely, 2^25438424850 is an apocalyptic number.

25438424850 is an abundant number, since it is smaller than the sum of its proper divisors (45110845422).

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

25438424850 is a wasteful number, since it uses less digits than its factorization.

25438424850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823592 (or 1823584 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 45.

The spelling of 25438424850 in words is "twenty-five billion, four hundred thirty-eight million, four hundred twenty-four thousand, eight hundred fifty".