1808157012533 has 2 divisors, whose sum is σ = 1808157012534. Its totient is φ = 1808157012532.

The previous prime is 1808157012479. The next prime is 1808157012559. The reversal of 1808157012533 is 3352107518081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1793461996804 + 14695015729 = 1339202^2 + 121223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1808157012533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808157017533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904078506266 + 904078506267.

It is an arithmetic number, because the mean of its divisors is an integer number (904078506267).

Almost surely, 2^{1808157012533} is an apocalyptic number.

It is an amenable number.

1808157012533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808157012533 is an equidigital number, since it uses as much as digits as its factorization.

1808157012533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 1808157012533 in words is "one trillion, eight hundred eight billion, one hundred fifty-seven million, twelve thousand, five hundred thirty-three".