1165663045531 has 4 divisors (see below), whose sum is σ = 1234231459992. Its totient is φ = 1097094631072.

The previous prime is 1165663045513. The next prime is 1165663045559. The reversal of 1165663045531 is 1355403665611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1165663045531 - 2²³ = 1165654656923 is a prime.

It is a super-2 number, since 2×1165663045531² (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 (1165663045831) 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, 34284207205 + ... + 34284207238.

It is an arithmetic number, because the mean of its divisors is an integer number (308557864998).

Almost surely, 2^{1165663045531} is an apocalyptic number.

1165663045531 is a deficient number, since it is larger than the sum of its proper divisors (68568414461).

1165663045531 is an equidigital number, since it uses as much as digits as its factorization.

1165663045531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68568414460.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 1165663045531 in words is "one trillion, one hundred sixty-five billion, six hundred sixty-three million, forty-five thousand, five hundred thirty-one".