6256631861 has 4 divisors (see below), whose sum is σ = 6258989292. Its totient is φ = 6254274432.

The previous prime is 6256631837. The next prime is 6256631863. The reversal of 6256631861 is 1681366526.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2291536900 + 3965094961 = 47870^2 + 62969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6256631861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6256631863) 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, 1174730 + ... + 1180043.

It is an arithmetic number, because the mean of its divisors is an integer number (1564747323).

Almost surely, 2^6256631861 is an apocalyptic number.

It is an amenable number.

6256631861 is a deficient number, since it is larger than the sum of its proper divisors (2357431).

6256631861 is a wasteful number, since it uses less digits than its factorization.

6256631861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357430.

The product of its digits is 311040, while the sum is 44.

The square root of 6256631861 is about 79098.8739553225. The cubic root of 6256631861 is about 1842.6670386091.

The spelling of 6256631861 in words is "six billion, two hundred fifty-six million, six hundred thirty-one thousand, eight hundred sixty-one".