1121558218561 has 8 divisors (see below), whose sum is σ = 1276714494144. Its totient is φ = 975268015920.

The previous prime is 1121558218553. The next prime is 1121558218591. The reversal of 1121558218561 is 1658128551211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1121558218561 - 2³ = 1121558218553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121558218511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2216517966 + ... + 2216518471.

It is an arithmetic number, because the mean of its divisors is an integer number (159589311768).

Almost surely, 2^{1121558218561} is an apocalyptic number.

1121558218561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121558218561 is a deficient number, since it is larger than the sum of its proper divisors (155156275583).

1121558218561 is a wasteful number, since it uses less digits than its factorization.

1121558218561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433036471.

The product of its digits is 192000, while the sum is 46.

The spelling of 1121558218561 in words is "one trillion, one hundred twenty-one billion, five hundred fifty-eight million, two hundred eighteen thousand, five hundred sixty-one".