25215345546 has 32 divisors (see below), whose sum is σ = 52202448000. Its totient is φ = 8110186560.

The previous prime is 25215345541. The next prime is 25215345559. The reversal of 25215345546 is 64554351252.

It is a junction number, because it is equal to n+sod(n) for n = 25215345498 and 25215345507.

It is not an unprimeable number, because it can be changed into a prime (25215345541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237355 + ... + 326753.

It is an arithmetic number, because the mean of its divisors is an integer number (1631326500).

Almost surely, 2^25215345546 is an apocalyptic number.

25215345546 is an abundant number, since it is smaller than the sum of its proper divisors (26987102454).

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

25215345546 is a wasteful number, since it uses less digits than its factorization.

25215345546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91054.

The product of its digits is 720000, while the sum is 42.

Adding to 25215345546 its reverse (64554351252), we get a palindrome (89769696798).

The spelling of 25215345546 in words is "twenty-five billion, two hundred fifteen million, three hundred forty-five thousand, five hundred forty-six".