81033410077 has 4 divisors (see below), whose sum is σ = 85800081276. Its totient is φ = 76266738880.

The previous prime is 81033410053. The next prime is 81033410113. The reversal of 81033410077 is 77001433018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77001433018 = 2 ⋅38500716509.

It can be written as a sum of positive squares in 2 ways, for example, as 24165946116 + 56867463961 = 155454^2 + 238469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81033410077 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 (81033410977) 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, 2383335574 + ... + 2383335607.

It is an arithmetic number, because the mean of its divisors is an integer number (21450020319).

Almost surely, 2^81033410077 is an apocalyptic number.

It is an amenable number.

81033410077 is a deficient number, since it is larger than the sum of its proper divisors (4766671199).

81033410077 is a wasteful number, since it uses less digits than its factorization.

81033410077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4766671198.

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 81033410077 in words is "eighty-one billion, thirty-three million, four hundred ten thousand, seventy-seven".