5256671781 has 8 divisors (see below), whose sum is σ = 7313630400. Its totient is φ = 3352080512.

The previous prime is 5256671743. The next prime is 5256671843. The reversal of 5256671781 is 1871766525.

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

It is a cyclic number.

It is not a de Polignac number, because 5256671781 - 2⁷ = 5256671653 is a prime.

It is a super-2 number, since 2×5256671781² = 55265196426323423922, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 5256671781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5256671731) 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, 38091756 + ... + 38091893.

It is an arithmetic number, because the mean of its divisors is an integer number (914203800).

Almost surely, 2^5256671781 is an apocalyptic number.

It is an amenable number.

5256671781 is a deficient number, since it is larger than the sum of its proper divisors (2056958619).

5256671781 is a wasteful number, since it uses less digits than its factorization.

5256671781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76183675.

The product of its digits is 705600, while the sum is 48.

The square root of 5256671781 is about 72502.9087761312. The cubic root of 5256671781 is about 1738.7492421736.

The spelling of 5256671781 in words is "five billion, two hundred fifty-six million, six hundred seventy-one thousand, seven hundred eighty-one".