1165185478537 has 4 divisors (see below), whose sum is σ = 1167003241236. Its totient is φ = 1163367715840.

The previous prime is 1165185478469. The next prime is 1165185478543. The reversal of 1165185478537 is 7358745815611.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 685800953161 + 479384525376 = 828131^2 + 692376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165185478537 - 2¹¹ = 1165185476489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165185478837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908880388 + ... + 908881669.

It is an arithmetic number, because the mean of its divisors is an integer number (291750810309).

Almost surely, 2^{1165185478537} is an apocalyptic number.

It is an amenable number.

1165185478537 is a deficient number, since it is larger than the sum of its proper divisors (1817762699).

1165185478537 is an equidigital number, since it uses as much as digits as its factorization.

1165185478537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817762698.

The product of its digits is 28224000, while the sum is 61.

The spelling of 1165185478537 in words is "one trillion, one hundred sixty-five billion, one hundred eighty-five million, four hundred seventy-eight thousand, five hundred thirty-seven".