1163256550891 has 16 divisors (see below), whose sum is σ = 1188880639488. Its totient is φ = 1137887546400.

The previous prime is 1163256550889. The next prime is 1163256550921. The reversal of 1163256550891 is 1980556523611.

It is a cyclic number.

It is not a de Polignac number, because 1163256550891 - 2¹ = 1163256550889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1163256554891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12852606 + ... + 12942796.

It is an arithmetic number, because the mean of its divisors is an integer number (74305039968).

Almost surely, 2^{1163256550891} is an apocalyptic number.

1163256550891 is a deficient number, since it is larger than the sum of its proper divisors (25624088597).

1163256550891 is a wasteful number, since it uses less digits than its factorization.

1163256550891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91602.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 1163256550891 in words is "one trillion, one hundred sixty-three billion, two hundred fifty-six million, five hundred fifty thousand, eight hundred ninety-one".