820029545081 has 4 divisors (see below), whose sum is σ = 820495737600. Its totient is φ = 819563352564.

The previous prime is 820029545053. The next prime is 820029545119. The reversal of 820029545081 is 180545920028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 820029545081 - 2¹⁰ = 820029544057 is a prime.

It is a super-2 number, since 2×820029545081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820029545011) 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, 233093621 + ... + 233097138.

It is an arithmetic number, because the mean of its divisors is an integer number (205123934400).

Almost surely, 2^820029545081 is an apocalyptic number.

It is an amenable number.

820029545081 is a deficient number, since it is larger than the sum of its proper divisors (466192519).

820029545081 is a wasteful number, since it uses less digits than its factorization.

820029545081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466192518.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 820029545081 in words is "eight hundred twenty billion, twenty-nine million, five hundred forty-five thousand, eighty-one".