25315206655 has 4 divisors (see below), whose sum is σ = 30378247992. Its totient is φ = 20252165320.

The previous prime is 25315206649. The next prime is 25315206731. The reversal of 25315206655 is 55660251352.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-25315206655 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 2531520661 + ... + 2531520670.

It is an arithmetic number, because the mean of its divisors is an integer number (7594561998).

Almost surely, 2^25315206655 is an apocalyptic number.

25315206655 is a deficient number, since it is larger than the sum of its proper divisors (5063041337).

25315206655 is an equidigital number, since it uses as much as digits as its factorization.

25315206655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063041336.

The product of its (nonzero) digits is 270000, while the sum is 40.

The spelling of 25315206655 in words is "twenty-five billion, three hundred fifteen million, two hundred six thousand, six hundred fifty-five".