25215544442 has 32 divisors (see below), whose sum is σ = 43444728000. Its totient is φ = 10855555200.

The previous prime is 25215544427. The next prime is 25215544447. The reversal of 25215544442 is 24444551252.

25215544442 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 25215544396 and 25215544405.

It is not an unprimeable number, because it can be changed into a prime (25215544447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2900342 + ... + 2909022.

It is an arithmetic number, because the mean of its divisors is an integer number (1357647750).

Almost surely, 2^25215544442 is an apocalyptic number.

25215544442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25215544442 is a deficient number, since it is larger than the sum of its proper divisors (18229183558).

25215544442 is a wasteful number, since it uses less digits than its factorization.

25215544442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15662.

The product of its digits is 256000, while the sum is 38.

The spelling of 25215544442 in words is "twenty-five billion, two hundred fifteen million, five hundred forty-four thousand, four hundred forty-two".