81322216885 has 32 divisors (see below), whose sum is σ = 120146487552. Its totient is φ = 51457213440.

The previous prime is 81322216873. The next prime is 81322216897. The reversal of 81322216885 is 58861222318.

It is an interprime number because it is at equal distance from previous prime (81322216873) and next prime (81322216897).

It is not a de Polignac number, because 81322216885 - 2¹⁷ = 81322085813 is a prime.

It is a super-2 number, since 2×81322216885² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1422045 + ... + 1478125.

It is an arithmetic number, because the mean of its divisors is an integer number (3754577736).

Almost surely, 2^81322216885 is an apocalyptic number.

It is an amenable number.

81322216885 is a deficient number, since it is larger than the sum of its proper divisors (38824270667).

81322216885 is a wasteful number, since it uses less digits than its factorization.

81322216885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59293.

The product of its digits is 368640, while the sum is 46.

The spelling of 81322216885 in words is "eighty-one billion, three hundred twenty-two million, two hundred sixteen thousand, eight hundred eighty-five".