81850699393 has 8 divisors (see below), whose sum is σ = 86182682400. Its totient is φ = 77521121568.

The previous prime is 81850699379. The next prime is 81850699423. The reversal of 81850699393 is 39399605818.

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

It is a cyclic number.

It is not a de Polignac number, because 81850699393 - 2¹³ = 81850691201 is a prime.

It is a super-2 number, since 2×81850699393² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81850699093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531223 + ... + 667756.

It is an arithmetic number, because the mean of its divisors is an integer number (10772835300).

Almost surely, 2^81850699393 is an apocalyptic number.

It is an amenable number.

81850699393 is a deficient number, since it is larger than the sum of its proper divisors (4331983007).

81850699393 is a wasteful number, since it uses less digits than its factorization.

81850699393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202591.

The product of its (nonzero) digits is 12597120, while the sum is 61.

The spelling of 81850699393 in words is "eighty-one billion, eight hundred fifty million, six hundred ninety-nine thousand, three hundred ninety-three".