1123861481565 has 32 divisors (see below), whose sum is σ = 1806826144896. Its totient is φ = 596516843520.

The previous prime is 1123861481531. The next prime is 1123861481579. The reversal of 1123861481565 is 5651841683211.

It is not a de Polignac number, because 1123861481565 - 2²² = 1123857287261 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2504589 + ... + 2919021.

It is an arithmetic number, because the mean of its divisors is an integer number (56463317028).

Almost surely, 2^{1123861481565} is an apocalyptic number.

1123861481565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1123861481565 is a deficient number, since it is larger than the sum of its proper divisors (682964663331).

1123861481565 is a wasteful number, since it uses less digits than its factorization.

1123861481565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415309.

The product of its digits is 1382400, while the sum is 51.

It can be divided in two parts, 112386 and 1481565, that added together give a palindrome (1593951).

The spelling of 1123861481565 in words is "one trillion, one hundred twenty-three billion, eight hundred sixty-one million, four hundred eighty-one thousand, five hundred sixty-five".