1181252844405 has 24 divisors (see below), whose sum is σ = 2047586807448. Its totient is φ = 629976324096.

The previous prime is 1181252844389. The next prime is 1181252844407. The reversal of 1181252844405 is 5044482521811.

1181252844405 is a `hidden beast` number, since 1 + 1 + 8 + 125 + 2 + 84 + 440 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48490682436 + 1132762161969 = 220206^2 + 1064313^2 .

It is not a de Polignac number, because 1181252844405 - 2⁴ = 1181252844389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181252844407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 641449 + ... + 1665521.

It is an arithmetic number, because the mean of its divisors is an integer number (85316116977).

Almost surely, 2^{1181252844405} is an apocalyptic number.

1181252844405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1181252844405 is a deficient number, since it is larger than the sum of its proper divisors (866333963043).

1181252844405 is a wasteful number, since it uses less digits than its factorization.

1181252844405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049717 (or 1049714 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 45.

The spelling of 1181252844405 in words is "one trillion, one hundred eighty-one billion, two hundred fifty-two million, eight hundred forty-four thousand, four hundred five".