25212040405 has 16 divisors (see below), whose sum is σ = 32057712000. Its totient is φ = 18981518400.

The previous prime is 25212040397. The next prime is 25212040411. The reversal of 25212040405 is 50404021252.

It is not a de Polignac number, because 25212040405 - 2³ = 25212040397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25212040405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 864430 + ... + 893119.

It is an arithmetic number, because the mean of its divisors is an integer number (2003607000).

Almost surely, 2^25212040405 is an apocalyptic number.

It is an amenable number.

25212040405 is a deficient number, since it is larger than the sum of its proper divisors (6845671595).

25212040405 is a wasteful number, since it uses less digits than its factorization.

25212040405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757724.

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 25212040405 its reverse (50404021252), we get a palindrome (75616061657).

The spelling of 25212040405 in words is "twenty-five billion, two hundred twelve million, forty thousand, four hundred five".