1808512679551 has 2 divisors, whose sum is σ = 1808512679552. Its totient is φ = 1808512679550.

The previous prime is 1808512679543. The next prime is 1808512679609. The reversal of 1808512679551 is 1559762158081.

It is a happy number.

It is an a-pointer prime, because the next prime (1808512679609) can be obtained adding 1808512679551 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1808512679551 - 2³ = 1808512679543 is a prime.

It is a super-2 number, since 2×1808512679551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808512679521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904256339775 + 904256339776.

It is an arithmetic number, because the mean of its divisors is an integer number (904256339776).

Almost surely, 2^{1808512679551} is an apocalyptic number.

1808512679551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808512679551 is an equidigital number, since it uses as much as digits as its factorization.

1808512679551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 58.

The spelling of 1808512679551 in words is "one trillion, eight hundred eight billion, five hundred twelve million, six hundred seventy-nine thousand, five hundred fifty-one".