80471580781 has 4 divisors (see below), whose sum is σ = 80476875964. Its totient is φ = 80466285600.

The previous prime is 80471580767. The next prime is 80471580811. The reversal of 80471580781 is 18708517408.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68838016900 + 11633563881 = 262370^2 + 107859^2 .

It is a cyclic number.

It is not a de Polignac number, because 80471580781 - 2¹⁵ = 80471548013 is a prime.

It is a super-2 number, since 2×80471580781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80471580181) 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, 2624730 + ... + 2655211.

It is an arithmetic number, because the mean of its divisors is an integer number (20119218991).

Almost surely, 2^80471580781 is an apocalyptic number.

It is an amenable number.

80471580781 is a deficient number, since it is larger than the sum of its proper divisors (5295183).

80471580781 is a wasteful number, since it uses less digits than its factorization.

80471580781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5295182.

The product of its (nonzero) digits is 501760, while the sum is 49.

The spelling of 80471580781 in words is "eighty billion, four hundred seventy-one million, five hundred eighty thousand, seven hundred eighty-one".