1165118749421 has 4 divisors (see below), whose sum is σ = 1271038635744. Its totient is φ = 1059198863100.

The previous prime is 1165118749411. The next prime is 1165118749513. The reversal of 1165118749421 is 1249478115611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1165118749421 - 2³⁴ = 1147938880237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1165118749421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165118749411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52959943145 + ... + 52959943166.

It is an arithmetic number, because the mean of its divisors is an integer number (317759658936).

Almost surely, 2^{1165118749421} is an apocalyptic number.

1165118749421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165118749421 is a deficient number, since it is larger than the sum of its proper divisors (105919886323).

1165118749421 is a wasteful number, since it uses less digits than its factorization.

1165118749421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105919886322.

The product of its digits is 483840, while the sum is 50.

The spelling of 1165118749421 in words is "one trillion, one hundred sixty-five billion, one hundred eighteen million, seven hundred forty-nine thousand, four hundred twenty-one".