25770656551 has 4 divisors (see below), whose sum is σ = 26207447400. Its totient is φ = 25333865704.

The previous prime is 25770656537. The next prime is 25770656579. The reversal of 25770656551 is 15565607752.

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

It is a cyclic number.

It is not a de Polignac number, because 25770656551 - 2⁷ = 25770656423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25770656495 and 25770656504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25770056551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218395336 + ... + 218395453.

It is an arithmetic number, because the mean of its divisors is an integer number (6551861850).

Almost surely, 2^25770656551 is an apocalyptic number.

25770656551 is a deficient number, since it is larger than the sum of its proper divisors (436790849).

25770656551 is an equidigital number, since it uses as much as digits as its factorization.

25770656551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436790848.

The product of its (nonzero) digits is 2205000, while the sum is 49.

The spelling of 25770656551 in words is "twenty-five billion, seven hundred seventy million, six hundred fifty-six thousand, five hundred fifty-one".