81002216534 has 16 divisors (see below), whose sum is σ = 122053314240. Its totient is φ = 40317860160.

The previous prime is 81002216531. The next prime is 81002216543. The reversal of 81002216534 is 43561220018.

It is a super-2 number, since 2×81002216534² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81002216534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81002216531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2247347 + ... + 2283105.

It is an arithmetic number, because the mean of its divisors is an integer number (7628332140).

Almost surely, 2^81002216534 is an apocalyptic number.

81002216534 is a deficient number, since it is larger than the sum of its proper divisors (41051097706).

81002216534 is a wasteful number, since it uses less digits than its factorization.

81002216534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40855.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 81002216534 in words is "eighty-one billion, two million, two hundred sixteen thousand, five hundred thirty-four".