81385529950 has 12 divisors (see below), whose sum is σ = 151377085800. Its totient is φ = 32554211960.

The previous prime is 81385529839. The next prime is 81385529959. The reversal of 81385529950 is 5992558318.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81385529891 and 81385529900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81385529959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 813855250 + ... + 813855349.

It is an arithmetic number, because the mean of its divisors is an integer number (12614757150).

Almost surely, 2^81385529950 is an apocalyptic number.

81385529950 is a deficient number, since it is larger than the sum of its proper divisors (69991555850).

81385529950 is a wasteful number, since it uses less digits than its factorization.

81385529950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627710611 (or 1627710606 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 81385529950 in words is "eighty-one billion, three hundred eighty-five million, five hundred twenty-nine thousand, nine hundred fifty".