81630850427 has 24 divisors (see below), whose sum is σ = 100602525744. Its totient is φ = 65815206912.

The previous prime is 81630850417. The next prime is 81630850439. The reversal of 81630850427 is 72405803618.

It is not a de Polignac number, because 81630850427 - 2³⁰ = 80557108603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81630850417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1452668 + ... + 1507814.

It is an arithmetic number, because the mean of its divisors is an integer number (4191771906).

Almost surely, 2^81630850427 is an apocalyptic number.

81630850427 is a deficient number, since it is larger than the sum of its proper divisors (18971675317).

81630850427 is a wasteful number, since it uses less digits than its factorization.

81630850427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56955 (or 56948 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 81630850427 in words is "eighty-one billion, six hundred thirty million, eight hundred fifty thousand, four hundred twenty-seven".