1205440505613 has 12 divisors (see below), whose sum is σ = 1741391016768. Its totient is φ = 803535076680.

The previous prime is 1205440505593. The next prime is 1205440505653. The reversal of 1205440505613 is 3165050445021.

1205440505613 is a `hidden beast` number, since 1 + 2 + 0 + 5 + 4 + 40 + 50 + 561 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1205440505613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205440505653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7577493 + ... + 7734938.

It is an arithmetic number, because the mean of its divisors is an integer number (145115918064).

Almost surely, 2^{1205440505613} is an apocalyptic number.

It is an amenable number.

1205440505613 is a deficient number, since it is larger than the sum of its proper divisors (535950511155).

1205440505613 is a wasteful number, since it uses less digits than its factorization.

1205440505613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15321184 (or 15321181 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 1205440505613 in words is "one trillion, two hundred five billion, four hundred forty million, five hundred five thousand, six hundred thirteen".