1813203063581 has 8 divisors (see below), whose sum is σ = 2231634539904. Its totient is φ = 1434622204080.

The previous prime is 1813203063571. The next prime is 1813203063619. The reversal of 1813203063581 is 1853603023181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1813203063581 - 2⁶ = 1813203063517 is a prime.

It is a super-2 number, since 2×1813203063581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813203063571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9962654105 + ... + 9962654286.

It is an arithmetic number, because the mean of its divisors is an integer number (278954317488).

Almost surely, 2^{1813203063581} is an apocalyptic number.

It is an amenable number.

1813203063581 is a deficient number, since it is larger than the sum of its proper divisors (418431476323).

1813203063581 is a wasteful number, since it uses less digits than its factorization.

1813203063581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19925308411.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 1813203063581 in words is "one trillion, eight hundred thirteen billion, two hundred three million, sixty-three thousand, five hundred eighty-one".