81313788362 has 8 divisors (see below), whose sum is σ = 124807210176. Its totient is φ = 39711384972.

The previous prime is 81313788343. The next prime is 81313788433. The reversal of 81313788362 is 26388731318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81313788362² (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 81313788362.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472754498 + ... + 472754669.

It is an arithmetic number, because the mean of its divisors is an integer number (15600901272).

Almost surely, 2^81313788362 is an apocalyptic number.

81313788362 is a deficient number, since it is larger than the sum of its proper divisors (43493421814).

81313788362 is a wasteful number, since it uses less digits than its factorization.

81313788362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945509212.

The product of its digits is 1161216, while the sum is 50.

The spelling of 81313788362 in words is "eighty-one billion, three hundred thirteen million, seven hundred eighty-eight thousand, three hundred sixty-two".