81946625050 has 24 divisors (see below), whose sum is σ = 156540205116. Its totient is φ = 31892739840.

The previous prime is 81946625041. The next prime is 81946625051. The reversal of 81946625050 is 5052664918.

It can be written as a sum of positive squares in 6 ways, for example, as 18479411721 + 63467213329 = 135939^2 + 251927^2 .

It is not an unprimeable number, because it can be changed into a prime (81946625051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22145887 + ... + 22149586.

Almost surely, 2^81946625050 is an apocalyptic number.

81946625050 is a deficient number, since it is larger than the sum of its proper divisors (74593580066).

81946625050 is a wasteful number, since it uses less digits than its factorization.

81946625050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44295522 (or 44295517 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 81946625050 in words is "eighty-one billion, nine hundred forty-six million, six hundred twenty-five thousand, fifty".