81850699422 has 48 divisors (see below), whose sum is σ = 183976595712. Its totient is φ = 27273902040.

The previous prime is 81850699379. The next prime is 81850699423. The reversal of 81850699422 is 22499605818.

It is a happy number.

81850699422 is a `hidden beast` number, since 8 + 1 + 8 + 506 + 99 + 42 + 2 = 666.

It is a super-2 number, since 2×81850699422² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81850699423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1415563 + ... + 1472249.

It is an arithmetic number, because the mean of its divisors is an integer number (3832845744).

Almost surely, 2^81850699422 is an apocalyptic number.

81850699422 is an abundant number, since it is smaller than the sum of its proper divisors (102125896290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81850699422 is a wasteful number, since it uses less digits than its factorization.

81850699422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59675 (or 59663 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 81850699422 in words is "eighty-one billion, eight hundred fifty million, six hundred ninety-nine thousand, four hundred twenty-two".