81633412706 has 8 divisors (see below), whose sum is σ = 122457010140. Its totient is φ = 40814409328.

The previous prime is 81633412691. The next prime is 81633412709. The reversal of 81633412706 is 60721433618.

It can be written as a sum of positive squares in 2 ways, for example, as 67930603225 + 13702809481 = 260635^2 + 117059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81633412709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103741 + ... + 1175376.

Almost surely, 2^81633412706 is an apocalyptic number.

81633412706 is a deficient number, since it is larger than the sum of its proper divisors (40823597434).

81633412706 is a wasteful number, since it uses less digits than its factorization.

81633412706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297028.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 81633412706 in words is "eighty-one billion, six hundred thirty-three million, four hundred twelve thousand, seven hundred six".