1813081778115 has 16 divisors (see below), whose sum is σ = 2962652779008. Its totient is φ = 946402970336.

The previous prime is 1813081778113. The next prime is 1813081778149. The reversal of 1813081778115 is 5118771803181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1813081778115 - 2¹ = 1813081778113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1813081778113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1285872897 + ... + 1285874306.

It is an arithmetic number, because the mean of its divisors is an integer number (185165798688).

Almost surely, 2^{1813081778115} is an apocalyptic number.

1813081778115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1813081778115 is a deficient number, since it is larger than the sum of its proper divisors (1149571000893).

1813081778115 is a wasteful number, since it uses less digits than its factorization.

1813081778115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571747258.

The product of its (nonzero) digits is 376320, while the sum is 51.

The spelling of 1813081778115 in words is "one trillion, eight hundred thirteen billion, eighty-one million, seven hundred seventy-eight thousand, one hundred fifteen".