25706078513 has 4 divisors (see below), whose sum is σ = 25743716208. Its totient is φ = 25668440820.

The previous prime is 25706078479. The next prime is 25706078537. The reversal of 25706078513 is 31587060752.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25706078513 - 2⁸ = 25706078257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25706978513) 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, 18817823 + ... + 18819188.

It is an arithmetic number, because the mean of its divisors is an integer number (6435929052).

Almost surely, 2^25706078513 is an apocalyptic number.

It is an amenable number.

25706078513 is a deficient number, since it is larger than the sum of its proper divisors (37637695).

25706078513 is an equidigital number, since it uses as much as digits as its factorization.

25706078513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37637694.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 25706078513 in words is "twenty-five billion, seven hundred six million, seventy-eight thousand, five hundred thirteen".