1121537611540 has 72 divisors (see below), whose sum is σ = 2398495613472. Its totient is φ = 440519808960.

The previous prime is 1121537611507. The next prime is 1121537611589. The reversal of 1121537611540 is 451167351211.

It is a super-2 number, since 2×1121537611540² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1121537611540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65921635 + ... + 65938645.

It is an arithmetic number, because the mean of its divisors is an integer number (33312439076).

Almost surely, 2^{1121537611540} is an apocalyptic number.

1121537611540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121537611540 is an abundant number, since it is smaller than the sum of its proper divisors (1276958001932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121537611540 is a wasteful number, since it uses less digits than its factorization.

1121537611540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18085 (or 18024 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 1121537611540 in words is "one trillion, one hundred twenty-one billion, five hundred thirty-seven million, six hundred eleven thousand, five hundred forty".