81850699380 has 72 divisors (see below), whose sum is σ = 239579720352. Its totient is φ = 20877851456.

The previous prime is 81850699379. The next prime is 81850699423. The reversal of 81850699380 is 8399605818.

It is a self number, because there is not a number n which added to its sum of digits gives 81850699380.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1257654 + ... + 1321133.

It is an arithmetic number, because the mean of its divisors is an integer number (3327496116).

Almost surely, 2^81850699380 is an apocalyptic number.

It is an amenable number.

81850699380 is an abundant number, since it is smaller than the sum of its proper divisors (157729020972).

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

81850699380 is a wasteful number, since it uses less digits than its factorization.

81850699380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578845 (or 2578820 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 57.

The spelling of 81850699380 in words is "eighty-one billion, eight hundred fifty million, six hundred ninety-nine thousand, three hundred eighty".