2661105318740 has 36 divisors (see below), whose sum is σ = 6142534844628. Its totient is φ = 967674660480.

The previous prime is 2661105318719. The next prime is 2661105318743. The reversal of 2661105318740 is 478135011662.

It can be written as a sum of positive squares in 2 ways, for example, as 948430567876 + 1712674750864 = 973874^2 + 1308692^2 .

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 2661105318691 and 2661105318700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661105318743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549812729 + ... + 549817568.

Almost surely, 2^{2661105318740} is an apocalyptic number.

2661105318740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661105318740 is an abundant number, since it is smaller than the sum of its proper divisors (3481429525888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2661105318740 is a wasteful number, since it uses less digits than its factorization.

2661105318740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099630328 (or 1099630315 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 2661105318740 in words is "two trillion, six hundred sixty-one billion, one hundred five million, three hundred eighteen thousand, seven hundred forty".