5771781861 has 8 divisors (see below), whose sum is σ = 7696251264. Its totient is φ = 3847583520.

The previous prime is 5771781857. The next prime is 5771781863. The reversal of 5771781861 is 1681871775.

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

It is not a de Polignac number, because 5771781861 - 2² = 5771781857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5771781863) 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, 11376 + ... + 108041.

It is an arithmetic number, because the mean of its divisors is an integer number (962031408).

Almost surely, 2^5771781861 is an apocalyptic number.

It is an amenable number.

5771781861 is a deficient number, since it is larger than the sum of its proper divisors (1924469403).

5771781861 is a wasteful number, since it uses less digits than its factorization.

5771781861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135531.

The product of its digits is 658560, while the sum is 51.

The square root of 5771781861 is about 75972.2440171409. The cubic root of 5771781861 is about 1793.7832719797.

The spelling of 5771781861 in words is "five billion, seven hundred seventy-one million, seven hundred eighty-one thousand, eight hundred sixty-one".