1813261157459 has 16 divisors (see below), whose sum is σ = 2023434082080. Its totient is φ = 1614808235520.

The previous prime is 1813261157447. The next prime is 1813261157479. The reversal of 1813261157459 is 9547511623181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1813261157459 - 2²⁴ = 1813244380243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1813261157459.

It is not an unprimeable number, because it can be changed into a prime (1813261157419) 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 15 ways as a sum of consecutive naturals, for example, 3153704 + ... + 3684069.

It is an arithmetic number, because the mean of its divisors is an integer number (126464630130).

Almost surely, 2^{1813261157459} is an apocalyptic number.

1813261157459 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1813261157459 is a deficient number, since it is larger than the sum of its proper divisors (210172924621).

1813261157459 is a wasteful number, since it uses less digits than its factorization.

1813261157459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838630.

The product of its digits is 1814400, while the sum is 53.

The spelling of 1813261157459 in words is "one trillion, eight hundred thirteen billion, two hundred sixty-one million, one hundred fifty-seven thousand, four hundred fifty-nine".