1840118456781 has 48 divisors (see below), whose sum is σ = 2938361287680. Its totient is φ = 1100406137760.

The previous prime is 1840118456767. The next prime is 1840118456783. The reversal of 1840118456781 is 1876548110481.

It is a happy number.

1840118456781 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 118 + 456 + 78 + 1 = 666.

It is not a de Polignac number, because 1840118456781 - 2¹³ = 1840118448589 is a prime.

It is a super-3 number, since 3×1840118456781³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1840118456783) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1832860 + ... + 2653226.

It is an arithmetic number, because the mean of its divisors is an integer number (61215860160).

Almost surely, 2^{1840118456781} is an apocalyptic number.

1840118456781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1840118456781 is a deficient number, since it is larger than the sum of its proper divisors (1098242830899).

1840118456781 is a wasteful number, since it uses less digits than its factorization.

1840118456781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820686 (or 820683 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 54.

The spelling of 1840118456781 in words is "one trillion, eight hundred forty billion, one hundred eighteen million, four hundred fifty-six thousand, seven hundred eighty-one".