80358205681 has 4 divisors (see below), whose sum is σ = 86539606132. Its totient is φ = 74176805232.

The previous prime is 80358205663. The next prime is 80358205687. The reversal of 80358205681 is 18650285308.

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 15528898225 + 64829307456 = 124615^2 + 254616^2 .

It is a cyclic number.

It is not a de Polignac number, because 80358205681 - 2¹⁷ = 80358074609 is a prime.

It is a super-2 number, since 2×80358205681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80358205687) 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, 3090700206 + ... + 3090700231.

It is an arithmetic number, because the mean of its divisors is an integer number (21634901533).

Almost surely, 2^80358205681 is an apocalyptic number.

80358205681 is the 163665-th hex number.

It is an amenable number.

80358205681 is a deficient number, since it is larger than the sum of its proper divisors (6181400451).

80358205681 is a wasteful number, since it uses less digits than its factorization.

80358205681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6181400450.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 80358205681 in words is "eighty billion, three hundred fifty-eight million, two hundred five thousand, six hundred eighty-one".