81333509650 has 24 divisors (see below), whose sum is σ = 157857735744. Its totient is φ = 31118907600.

The previous prime is 81333509641. The next prime is 81333509687. The reversal of 81333509650 is 5690533318.

It is a junction number, because it is equal to n+sod(n) for n = 81333509597 and 81333509606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35361246 + ... + 35363545.

It is an arithmetic number, because the mean of its divisors is an integer number (6577405656).

Almost surely, 2^81333509650 is an apocalyptic number.

81333509650 is a deficient number, since it is larger than the sum of its proper divisors (76524226094).

81333509650 is a wasteful number, since it uses less digits than its factorization.

81333509650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70724826 (or 70724821 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 81333509650 in words is "eighty-one billion, three hundred thirty-three million, five hundred nine thousand, six hundred fifty".