5671981845 has 12 divisors (see below), whose sum is σ = 9831435276. Its totient is φ = 3025056960.

The previous prime is 5671981841. The next prime is 5671981883. The reversal of 5671981845 is 5481891765.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1610978769 + 4061003076 = 40137^2 + 63726^2 .

It is not a de Polignac number, because 5671981845 - 2² = 5671981841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5671981791 and 5671981800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5671981841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63021976 + ... + 63022065.

It is an arithmetic number, because the mean of its divisors is an integer number (819286273).

Almost surely, 2^5671981845 is an apocalyptic number.

It is an amenable number.

5671981845 is a deficient number, since it is larger than the sum of its proper divisors (4159453431).

5671981845 is a wasteful number, since it uses less digits than its factorization.

5671981845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126044052 (or 126044049 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The square root of 5671981845 is about 75312.5610041247. The cubic root of 5671981845 is about 1783.3843205694.

The spelling of 5671981845 in words is "five billion, six hundred seventy-one million, nine hundred eighty-one thousand, eight hundred forty-five".