1808390648405 has 16 divisors (see below), whose sum is σ = 2390786851968. Its totient is φ = 1302171480000.

The previous prime is 1808390648357. The next prime is 1808390648411. The reversal of 1808390648405 is 5048460938081.

It is a happy number.

It is not a de Polignac number, because 1808390648405 - 2⁶ = 1808390648341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162765881 + ... + 162776990.

It is an arithmetic number, because the mean of its divisors is an integer number (149424178248).

Almost surely, 2^{1808390648405} is an apocalyptic number.

It is an amenable number.

1808390648405 is a deficient number, since it is larger than the sum of its proper divisors (582396203563).

1808390648405 is a wasteful number, since it uses less digits than its factorization.

1808390648405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325542988.

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 1808390648405 in words is "one trillion, eight hundred eight billion, three hundred ninety million, six hundred forty-eight thousand, four hundred five".