1157666111 has 6 divisors (see below), whose sum is σ = 1346672880. Its totient is φ = 992285196.

The previous prime is 1157666093. The next prime is 1157666123. The reversal of 1157666111 is 1116667511.

It is not a de Polignac number, because 1157666111 - 2¹⁰ = 1157665087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157666161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11812871 + ... + 11812968.

It is an arithmetic number, because the mean of its divisors is an integer number (224445480).

Almost surely, 2^1157666111 is an apocalyptic number.

1157666111 is a deficient number, since it is larger than the sum of its proper divisors (189006769).

1157666111 is an equidigital number, since it uses as much as digits as its factorization.

1157666111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23625853 (or 23625846 counting only the distinct ones).

The product of its digits is 7560, while the sum is 35.

The square root of 1157666111 is about 34024.4928103271. The cubic root of 1157666111 is about 1050.0124294825.

The spelling of 1157666111 in words is "one billion, one hundred fifty-seven million, six hundred sixty-six thousand, one hundred eleven".