1164545297881 has 27 divisors (see below), whose sum is σ = 1400065525503. Its totient is φ = 965788029360.

The previous prime is 1164545297827. The next prime is 1164545297921. The reversal of 1164545297881 is 1887925454611.

It is a happy number.

The square root of 1164545297881 is 1079141.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 755308737225 + 409236560656 = 869085^2 + 639716^2 .

It is not a de Polignac number, because 1164545297881 - 2¹¹ = 1164545295833 is a prime.

It is a super-2 number, since 2×1164545297881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1164545297821) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 234171111 + ... + 234176083.

Almost surely, 2^{1164545297881} is an apocalyptic number.

1164545297881 is the 1079141-st square number.

1164545297881 is the 539571-st centered octagonal number.

It is an amenable number.

1164545297881 is a deficient number, since it is larger than the sum of its proper divisors (235520227622).

1164545297881 is an frugal number, since it uses more digits than its factorization.

1164545297881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10022 (or 5011 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 61.

The spelling of 1164545297881 in words is "one trillion, one hundred sixty-four billion, five hundred forty-five million, two hundred ninety-seven thousand, eight hundred eighty-one".