1163256554891 has 2 divisors, whose sum is σ = 1163256554892. Its totient is φ = 1163256554890.

The previous prime is 1163256554881. The next prime is 1163256554909. The reversal of 1163256554891 is 1984556523611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1163256554891 - 2¹⁰ = 1163256553867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1163256554821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 581628277445 + 581628277446.

It is an arithmetic number, because the mean of its divisors is an integer number (581628277446).

Almost surely, 2^{1163256554891} is an apocalyptic number.

1163256554891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1163256554891 is an equidigital number, since it uses as much as digits as its factorization.

1163256554891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776000, while the sum is 56.

The spelling of 1163256554891 in words is "one trillion, one hundred sixty-three billion, two hundred fifty-six million, five hundred fifty-four thousand, eight hundred ninety-one".