1205827445881 has 4 divisors (see below), whose sum is σ = 1205832255732. Its totient is φ = 1205822636032.

The previous prime is 1205827445857. The next prime is 1205827445899. The reversal of 1205827445881 is 1885447285021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1077101487225 + 128725958656 = 1037835^2 + 358784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205827445881 - 2²³ = 1205819057273 is a prime.

It is a super-2 number, since 2×1205827445881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205827449881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006920 + ... + 2537593.

It is an arithmetic number, because the mean of its divisors is an integer number (301458063933).

Almost surely, 2^{1205827445881} is an apocalyptic number.

It is an amenable number.

1205827445881 is a deficient number, since it is larger than the sum of its proper divisors (4809851).

1205827445881 is an equidigital number, since it uses as much as digits as its factorization.

1205827445881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4809850.

The product of its (nonzero) digits is 5734400, while the sum is 55.

The spelling of 1205827445881 in words is "one trillion, two hundred five billion, eight hundred twenty-seven million, four hundred forty-five thousand, eight hundred eighty-one".