5220161866 has 4 divisors (see below), whose sum is σ = 7830242802. Its totient is φ = 2610080932.

The previous prime is 5220161851. The next prime is 5220161867. The reversal of 5220161866 is 6681610225.

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

It can be written as a sum of positive squares in only one way, i.e., 5065880625 + 154281241 = 71175^2 + 12421^2 .

It is not an unprimeable number, because it can be changed into a prime (5220161867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305040465 + ... + 1305040468.

Almost surely, 2^5220161866 is an apocalyptic number.

5220161866 is a deficient number, since it is larger than the sum of its proper divisors (2610080936).

5220161866 is a wasteful number, since it uses less digits than its factorization.

5220161866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610080935.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 5220161866 is about 72250.6876507068. The cubic root of 5220161866 is about 1734.7144251720.

The spelling of 5220161866 in words is "five billion, two hundred twenty million, one hundred sixty-one thousand, eight hundred sixty-six".