7816221885 has 32 divisors (see below), whose sum is σ = 12796502400. Its totient is φ = 4072723200.

The previous prime is 7816221877. The next prime is 7816221893. The reversal of 7816221885 is 5881226187.

It is an interprime number because it is at equal distance from previous prime (7816221877) and next prime (7816221893).

It is not a de Polignac number, because 7816221885 - 2³ = 7816221877 is a prime.

It is a super-2 number, since 2×7816221885² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107670 + ... + 165000.

It is an arithmetic number, because the mean of its divisors is an integer number (399890700).

Almost surely, 2^7816221885 is an apocalyptic number.

It is an amenable number.

7816221885 is a deficient number, since it is larger than the sum of its proper divisors (4980280515).

7816221885 is a wasteful number, since it uses less digits than its factorization.

7816221885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57549.

The product of its digits is 430080, while the sum is 48.

The square root of 7816221885 is about 88409.3993023366. The cubic root of 7816221885 is about 1984.5663648909.

The spelling of 7816221885 in words is "seven billion, eight hundred sixteen million, two hundred twenty-one thousand, eight hundred eighty-five".