81039194606 has 16 divisors (see below), whose sum is σ = 123397849680. Its totient is φ = 39906820800.

The previous prime is 81039194603. The next prime is 81039194609. The reversal of 81039194606 is 60649193018.

It is an interprime number because it is at equal distance from previous prime (81039194603) and next prime (81039194609).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81039194603) 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, 639956 + ... + 756056.

It is an arithmetic number, because the mean of its divisors is an integer number (7712365605).

Almost surely, 2^81039194606 is an apocalyptic number.

81039194606 is a deficient number, since it is larger than the sum of its proper divisors (42358655074).

81039194606 is a wasteful number, since it uses less digits than its factorization.

81039194606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121379.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 81039194606 in words is "eighty-one billion, thirty-nine million, one hundred ninety-four thousand, six hundred six".