820039504091 has 8 divisors (see below), whose sum is σ = 850284993600. Its totient is φ = 789925232320.

The previous prime is 820039504021. The next prime is 820039504121. The reversal of 820039504091 is 190405930028.

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 820039504091 - 2²² = 820035309787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820039504021) 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, 32791706 + ... + 32816703.

It is an arithmetic number, because the mean of its divisors is an integer number (106285624200).

Almost surely, 2^820039504091 is an apocalyptic number.

820039504091 is a deficient number, since it is larger than the sum of its proper divisors (30245489509).

820039504091 is a wasteful number, since it uses less digits than its factorization.

820039504091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65608869.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 820039504091 in words is "eight hundred twenty billion, thirty-nine million, five hundred four thousand, ninety-one".