25531345405 has 8 divisors (see below), whose sum is σ = 31289478912. Its totient is φ = 19990500048.

The previous prime is 25531345391. The next prime is 25531345421. The reversal of 25531345405 is 50454313552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25531345405 - 2¹⁵ = 25531312637 is a prime.

It is a super-2 number, since 2×25531345405² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54321777 + ... + 54322246.

It is an arithmetic number, because the mean of its divisors is an integer number (3911184864).

Almost surely, 2^25531345405 is an apocalyptic number.

It is an amenable number.

25531345405 is a deficient number, since it is larger than the sum of its proper divisors (5758133507).

25531345405 is a wasteful number, since it uses less digits than its factorization.

25531345405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108644075.

The product of its (nonzero) digits is 180000, while the sum is 37.

Adding to 25531345405 its reverse (50454313552), we get a palindrome (75985658957).

The spelling of 25531345405 in words is "twenty-five billion, five hundred thirty-one million, three hundred forty-five thousand, four hundred five".