25222155438 has 32 divisors (see below), whose sum is σ = 51567761952. Its totient is φ = 8221737600.

The previous prime is 25222155421. The next prime is 25222155463. The reversal of 25222155438 is 83455122252.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25222155396 and 25222155405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135853 + ... + 262488.

It is an arithmetic number, because the mean of its divisors is an integer number (1611492561).

Almost surely, 2^25222155438 is an apocalyptic number.

25222155438 is an abundant number, since it is smaller than the sum of its proper divisors (26345606514).

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

25222155438 is a wasteful number, since it uses less digits than its factorization.

25222155438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398580.

The product of its digits is 192000, while the sum is 39.

The spelling of 25222155438 in words is "twenty-five billion, two hundred twenty-two million, one hundred fifty-five thousand, four hundred thirty-eight".