1156589955871 has 4 divisors (see below), whose sum is σ = 1321817092432. Its totient is φ = 991362819312.

The previous prime is 1156589955847. The next prime is 1156589955877. The reversal of 1156589955871 is 1785599856511.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156589955871 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 1156589955871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156589955877) 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, 82613568270 + ... + 82613568283.

It is an arithmetic number, because the mean of its divisors is an integer number (330454273108).

Almost surely, 2^{1156589955871} is an apocalyptic number.

1156589955871 is a deficient number, since it is larger than the sum of its proper divisors (165227136561).

1156589955871 is an equidigital number, since it uses as much as digits as its factorization.

1156589955871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165227136560.

The product of its digits is 136080000, while the sum is 70.

The spelling of 1156589955871 in words is "one trillion, one hundred fifty-six billion, five hundred eighty-nine million, nine hundred fifty-five thousand, eight hundred seventy-one".