25405240310243 has 32 divisors (see below), whose sum is σ = 25946523832320. Its totient is φ = 24872472576000.

The previous prime is 25405240310201. The next prime is 25405240310279. The reversal of 25405240310243 is 34201304250452.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25405240310243 - 2⁶ = 25405240310179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25405240910243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1305702371 + ... + 1305721827.

It is an arithmetic number, because the mean of its divisors is an integer number (810828869760).

Almost surely, 2^{25405240310243} is an apocalyptic number.

25405240310243 is a deficient number, since it is larger than the sum of its proper divisors (541283522077).

25405240310243 is a wasteful number, since it uses less digits than its factorization.

25405240310243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20219.

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 25405240310243 its reverse (34201304250452), we get a palindrome (59606544560695).

The spelling of 25405240310243 in words is "twenty-five trillion, four hundred five billion, two hundred forty million, three hundred ten thousand, two hundred forty-three".