80821105810 has 8 divisors (see below), whose sum is σ = 145477990476. Its totient is φ = 32328442320.

The previous prime is 80821105801. The next prime is 80821105811. The reversal of 80821105810 is 1850112808.

It can be written as a sum of positive squares in 2 ways, for example, as 68419388041 + 12401717769 = 261571^2 + 111363^2 .

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

It is a super-2 number, since 2×80821105810² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80821105811) 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, 4041055281 + ... + 4041055300.

Almost surely, 2^80821105810 is an apocalyptic number.

80821105810 is a deficient number, since it is larger than the sum of its proper divisors (64656884666).

80821105810 is a wasteful number, since it uses less digits than its factorization.

80821105810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8082110588.

The product of its (nonzero) digits is 5120, while the sum is 34.

The spelling of 80821105810 in words is "eighty billion, eight hundred twenty-one million, one hundred five thousand, eight hundred ten".