25478356511 has 4 divisors (see below), whose sum is σ = 25478713752. Its totient is φ = 25477999272.

The previous prime is 25478356481. The next prime is 25478356537. The reversal of 25478356511 is 11565387452.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25478356511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25478356411) 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, 30941 + ... + 227846.

It is an arithmetic number, because the mean of its divisors is an integer number (6369678438).

Almost surely, 2^25478356511 is an apocalyptic number.

25478356511 is a deficient number, since it is larger than the sum of its proper divisors (357241).

25478356511 is an equidigital number, since it uses as much as digits as its factorization.

25478356511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357240.

The product of its digits is 1008000, while the sum is 47.

The spelling of 25478356511 in words is "twenty-five billion, four hundred seventy-eight million, three hundred fifty-six thousand, five hundred eleven".