1166464111557 has 4 divisors (see below), whose sum is σ = 1555285482080. Its totient is φ = 777642741036.

The previous prime is 1166464111517. The next prime is 1166464111573. The reversal of 1166464111557 is 7551114646611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1166464111557 - 2¹⁸ = 1166463849413 is a prime.

It is a super-2 number, since 2×1166464111557² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166464111517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194410685257 + ... + 194410685262.

It is an arithmetic number, because the mean of its divisors is an integer number (388821370520).

Almost surely, 2^{1166464111557} is an apocalyptic number.

It is an amenable number.

1166464111557 is a deficient number, since it is larger than the sum of its proper divisors (388821370523).

1166464111557 is an equidigital number, since it uses as much as digits as its factorization.

1166464111557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388821370522.

The product of its digits is 604800, while the sum is 48.

The spelling of 1166464111557 in words is "one trillion, one hundred sixty-six billion, four hundred sixty-four million, one hundred eleven thousand, five hundred fifty-seven".