80804468639 has 2 divisors, whose sum is σ = 80804468640. Its totient is φ = 80804468638.

The previous prime is 80804468621. The next prime is 80804468729. The reversal of 80804468639 is 93686440808.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80804468639 - 2¹⁶ = 80804403103 is a prime.

It is a super-2 number, since 2×80804468639² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80804468539) 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 as a sum of consecutive naturals, namely, 40402234319 + 40402234320.

It is an arithmetic number, because the mean of its divisors is an integer number (40402234320).

Almost surely, 2^80804468639 is an apocalyptic number.

80804468639 is a deficient number, since it is larger than the sum of its proper divisors (1).

80804468639 is an equidigital number, since it uses as much as digits as its factorization.

80804468639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7962624, while the sum is 56.

The spelling of 80804468639 in words is "eighty billion, eight hundred four million, four hundred sixty-eight thousand, six hundred thirty-nine".