25513257811 has 8 divisors (see below), whose sum is σ = 26109065664. Its totient is φ = 24917562600.

The previous prime is 25513257799. The next prime is 25513257823. The reversal of 25513257811 is 11875231552.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25513257799) and next prime (25513257823).

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

It is a de Polignac number, because none of the positive numbers 2^k-25513257811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25513257851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583080 + ... + 625306.

It is an arithmetic number, because the mean of its divisors is an integer number (3263633208).

Almost surely, 2^25513257811 is an apocalyptic number.

25513257811 is a deficient number, since it is larger than the sum of its proper divisors (595807853).

25513257811 is a wasteful number, since it uses less digits than its factorization.

25513257811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56321.

The product of its digits is 84000, while the sum is 40.

The spelling of 25513257811 in words is "twenty-five billion, five hundred thirteen million, two hundred fifty-seven thousand, eight hundred eleven".