808891451861 has 4 divisors (see below), whose sum is σ = 809867196300. Its totient is φ = 807915707424.

The previous prime is 808891451831. The next prime is 808891451917. The reversal of 808891451861 is 168154198808.

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 147767972836 + 661123479025 = 384406^2 + 813095^2 .

It is a cyclic number.

It is not a de Polignac number, because 808891451861 - 2¹⁰ = 808891450837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 808891451861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808891451801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487870976 + ... + 487872633.

It is an arithmetic number, because the mean of its divisors is an integer number (202466799075).

Almost surely, 2^808891451861 is an apocalyptic number.

It is an amenable number.

808891451861 is a deficient number, since it is larger than the sum of its proper divisors (975744439).

808891451861 is an equidigital number, since it uses as much as digits as its factorization.

808891451861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975744438.

The product of its (nonzero) digits is 4423680, while the sum is 59.

The spelling of 808891451861 in words is "eight hundred eight billion, eight hundred ninety-one million, four hundred fifty-one thousand, eight hundred sixty-one".