1156157641165 has 4 divisors (see below), whose sum is σ = 1387389169404. Its totient is φ = 924926112928.

The previous prime is 1156157641141. The next prime is 1156157641237. The reversal of 1156157641165 is 5611467516511.

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 756110246116 + 400047395049 = 869546^2 + 632493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156157641165 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115615764112 + ... + 115615764121.

It is an arithmetic number, because the mean of its divisors is an integer number (346847292351).

Almost surely, 2^{1156157641165} is an apocalyptic number.

It is an amenable number.

1156157641165 is a deficient number, since it is larger than the sum of its proper divisors (231231528239).

1156157641165 is an equidigital number, since it uses as much as digits as its factorization.

1156157641165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231231528238.

The product of its digits is 756000, while the sum is 49.

The spelling of 1156157641165 in words is "one trillion, one hundred fifty-six billion, one hundred fifty-seven million, six hundred forty-one thousand, one hundred sixty-five".