1838846981665 has 16 divisors (see below), whose sum is σ = 2210410135440. Its totient is φ = 1468549336320.

The previous prime is 1838846981591. The next prime is 1838846981681. The reversal of 1838846981665 is 5661896488381.

It can be written as a sum of positive squares in 8 ways, for example, as 9634011409 + 1829212970256 = 98153^2 + 1352484^2 .

It is not a de Polignac number, because 1838846981665 - 2²⁵ = 1838813427233 is a prime.

It is a super-3 number, since 3×1838846981665³ (a number of 38 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16724691 + ... + 16834279.

It is an arithmetic number, because the mean of its divisors is an integer number (138150633465).

Almost surely, 2^{1838846981665} is an apocalyptic number.

It is an amenable number.

1838846981665 is a deficient number, since it is larger than the sum of its proper divisors (371563153775).

1838846981665 is a wasteful number, since it uses less digits than its factorization.

1838846981665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115332.

The product of its digits is 477757440, while the sum is 73.

The spelling of 1838846981665 in words is "one trillion, eight hundred thirty-eight billion, eight hundred forty-six million, nine hundred eighty-one thousand, six hundred sixty-five".