81435020466 has 16 divisors (see below), whose sum is σ = 168486249600. Its totient is φ = 26208972048.

The previous prime is 81435020461. The next prime is 81435020467. The reversal of 81435020466 is 66402053418.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81435020461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234008506 + ... + 234008853.

It is an arithmetic number, because the mean of its divisors is an integer number (10530390600).

Almost surely, 2^81435020466 is an apocalyptic number.

81435020466 is an abundant number, since it is smaller than the sum of its proper divisors (87051229134).

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

81435020466 is a wasteful number, since it uses less digits than its factorization.

81435020466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468017393.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 81435020466 in words is "eighty-one billion, four hundred thirty-five million, twenty thousand, four hundred sixty-six".