81526071515650 has 12 divisors (see below), whose sum is σ = 151638493019202. Its totient is φ = 32610428606240.

The previous prime is 81526071515639. The next prime is 81526071515683. The reversal of 81526071515650 is 5651517062518.

81526071515650 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 50676900550441 + 30849170965209 = 7118771^2 + 5554203^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 815260715107 + ... + 815260715206.

Almost surely, 2^{81526071515650} is an apocalyptic number.

81526071515650 is a deficient number, since it is larger than the sum of its proper divisors (70112421503552).

81526071515650 is a wasteful number, since it uses less digits than its factorization.

81526071515650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630521430325 (or 1630521430320 counting only the distinct ones).

The product of its (nonzero) digits is 2520000, while the sum is 52.

The spelling of 81526071515650 in words is "eighty-one trillion, five hundred twenty-six billion, seventy-one million, five hundred fifteen thousand, six hundred fifty".