81037937466 has 24 divisors (see below), whose sum is σ = 185910563124. Its totient is φ = 25423666560.

The previous prime is 81037937459. The next prime is 81037937467. The reversal of 81037937466 is 66473973018.

81037937466 is a `hidden beast` number, since 8 + 103 + 79 + 3 + 7 + 466 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75197156841 + 5840780625 = 274221^2 + 76425^2 .

It is not an unprimeable number, because it can be changed into a prime (81037937467) 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, 132414625 + ... + 132415236.

Almost surely, 2^81037937466 is an apocalyptic number.

81037937466 is an abundant number, since it is smaller than the sum of its proper divisors (104872625658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81037937466 is a wasteful number, since it uses less digits than its factorization.

81037937466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264829886 (or 264829883 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 81037937466 in words is "eighty-one billion, thirty-seven million, nine hundred thirty-seven thousand, four hundred sixty-six".