81502381022 has 16 divisors (see below), whose sum is σ = 125353645632. Its totient is φ = 39727627680.

The previous prime is 81502381007. The next prime is 81502381031. The reversal of 81502381022 is 22018320518.

It is a happy number.

It is a super-2 number, since 2×81502381022² (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 81502381022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2432054 + ... + 2465337.

It is an arithmetic number, because the mean of its divisors is an integer number (7834602852).

Almost surely, 2^81502381022 is an apocalyptic number.

81502381022 is a deficient number, since it is larger than the sum of its proper divisors (43851264610).

81502381022 is a wasteful number, since it uses less digits than its factorization.

81502381022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4897603.

The product of its (nonzero) digits is 7680, while the sum is 32.

The spelling of 81502381022 in words is "eighty-one billion, five hundred two million, three hundred eighty-one thousand, twenty-two".