81141892850 has 24 divisors (see below), whose sum is σ = 151039515888. Its totient is φ = 32431898000.

The previous prime is 81141892813. The next prime is 81141892877. The reversal of 81141892850 is 5829814118.

It is a super-2 number, since 2×81141892850² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81141892795 and 81141892804.

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 11 ways as a sum of consecutive naturals, for example, 555476 + ... + 686175.

It is an arithmetic number, because the mean of its divisors is an integer number (6293313162).

Almost surely, 2^81141892850 is an apocalyptic number.

81141892850 is a deficient number, since it is larger than the sum of its proper divisors (69897623038).

81141892850 is a wasteful number, since it uses less digits than its factorization.

81141892850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242970 (or 1242965 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 47.

The spelling of 81141892850 in words is "eighty-one billion, one hundred forty-one million, eight hundred ninety-two thousand, eight hundred fifty".