81311118202 has 16 divisors (see below), whose sum is σ = 122325664032. Its totient is φ = 40535954640.

The previous prime is 81311118197. The next prime is 81311118281. The reversal of 81311118202 is 20281111318.

It is a super-2 number, since 2×81311118202² (a number of 23 digits) contains 22 as substring.

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, 3380077 + ... + 3404047.

It is an arithmetic number, because the mean of its divisors is an integer number (7645354002).

Almost surely, 2^81311118202 is an apocalyptic number.

81311118202 is a deficient number, since it is larger than the sum of its proper divisors (41014545830).

81311118202 is a wasteful number, since it uses less digits than its factorization.

81311118202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28893.

The product of its (nonzero) digits is 768, while the sum is 28.

The spelling of 81311118202 in words is "eighty-one billion, three hundred eleven million, one hundred eighteen thousand, two hundred two".