1205747242865 has 64 divisors (see below), whose sum is σ = 1623252178944. Its totient is φ = 852223680000.

The previous prime is 1205747242853. The next prime is 1205747242883. The reversal of 1205747242865 is 5682427475021.

It is a happy number.

It is not a de Polignac number, because 1205747242865 - 2¹² = 1205747238769 is a prime.

It is a super-4 number, since 4×1205747242865⁴ (a number of 49 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 493955045 + ... + 493957485.

It is an arithmetic number, because the mean of its divisors is an integer number (25363315296).

Almost surely, 2^{1205747242865} is an apocalyptic number.

It is an amenable number.

1205747242865 is a deficient number, since it is larger than the sum of its proper divisors (417504936079).

1205747242865 is a wasteful number, since it uses less digits than its factorization.

1205747242865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3462.

The product of its (nonzero) digits is 7526400, while the sum is 53.

The spelling of 1205747242865 in words is "one trillion, two hundred five billion, seven hundred forty-seven million, two hundred forty-two thousand, eight hundred sixty-five".