5671321778 has 4 divisors (see below), whose sum is σ = 8506982670. Its totient is φ = 2835660888.

The previous prime is 5671321769. The next prime is 5671321781. The reversal of 5671321778 is 8771231765.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8771231765 = 5 ⋅1754246353.

It can be written as a sum of positive squares in only one way, i.e., 4416532849 + 1254788929 = 66457^2 + 35423^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1417830443 + ... + 1417830446.

Almost surely, 2^5671321778 is an apocalyptic number.

5671321778 is a deficient number, since it is larger than the sum of its proper divisors (2835660892).

5671321778 is a wasteful number, since it uses less digits than its factorization.

5671321778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835660891.

The product of its digits is 493920, while the sum is 47.

The square root of 5671321778 is about 75308.1786926228. The cubic root of 5671321778 is about 1783.3151384718.

The spelling of 5671321778 in words is "five billion, six hundred seventy-one million, three hundred twenty-one thousand, seven hundred seventy-eight".