1156347654721 has 6 divisors (see below), whose sum is σ = 1345139108610. Its totient is φ = 991155132576.

The previous prime is 1156347654667. The next prime is 1156347654727. The reversal of 1156347654721 is 1274567436511.

It can be written as a sum of positive squares in only one way, i.e., 818192611600 + 338155043121 = 904540^2 + 581511^2 .

It is not a de Polignac number, because 1156347654721 - 2²⁷ = 1156213436993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156347654727) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 11799465816 + ... + 11799465913.

It is an arithmetic number, because the mean of its divisors is an integer number (224189851435).

Almost surely, 2^{1156347654721} is an apocalyptic number.

It is an amenable number.

1156347654721 is a deficient number, since it is larger than the sum of its proper divisors (188791453889).

1156347654721 is an equidigital number, since it uses as much as digits as its factorization.

1156347654721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23598931743 (or 23598931736 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 52.

The spelling of 1156347654721 in words is "one trillion, one hundred fifty-six billion, three hundred forty-seven million, six hundred fifty-four thousand, seven hundred twenty-one".