25205212939 has 4 divisors (see below), whose sum is σ = 25205532760. Its totient is φ = 25204893120.

The previous prime is 25205212937. The next prime is 25205212961. The reversal of 25205212939 is 93921250252.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25205212939 - 2¹ = 25205212937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25205212937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51259 + ... + 230299.

It is an arithmetic number, because the mean of its divisors is an integer number (6301383190).

Almost surely, 2^25205212939 is an apocalyptic number.

25205212939 is a deficient number, since it is larger than the sum of its proper divisors (319821).

25205212939 is a wasteful number, since it uses less digits than its factorization.

25205212939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319820.

The product of its (nonzero) digits is 97200, while the sum is 40.

It can be divided in two parts, 25205 and 212939, that added together give a square (238144 = 488²).

The spelling of 25205212939 in words is "twenty-five billion, two hundred five million, two hundred twelve thousand, nine hundred thirty-nine".