81933249061 has 8 divisors (see below), whose sum is σ = 82251417600. Its totient is φ = 81615181680.

The previous prime is 81933249053. The next prime is 81933249103. The reversal of 81933249061 is 16094233918.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81933249061 - 2³ = 81933249053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81933249031) 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, 1871856 + ... + 1915126.

It is an arithmetic number, because the mean of its divisors is an integer number (10281427200).

Almost surely, 2^81933249061 is an apocalyptic number.

It is an amenable number.

81933249061 is a deficient number, since it is larger than the sum of its proper divisors (318168539).

81933249061 is a wasteful number, since it uses less digits than its factorization.

81933249061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50579.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 81933249061 in words is "eighty-one billion, nine hundred thirty-three million, two hundred forty-nine thousand, sixty-one".