1101666557 has 2 divisors, whose sum is σ = 1101666558. Its totient is φ = 1101666556.

The previous prime is 1101666523. The next prime is 1101666571. The reversal of 1101666557 is 7556661011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 740438521 + 361228036 = 27211^2 + 19006^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101666557 - 2²⁸ = 833231101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1101666557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101663557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550833278 + 550833279.

It is an arithmetic number, because the mean of its divisors is an integer number (550833279).

Almost surely, 2^1101666557 is an apocalyptic number.

It is an amenable number.

1101666557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101666557 is an equidigital number, since it uses as much as digits as its factorization.

1101666557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1101666557 is about 33191.3626866991. The cubic root of 1101666557 is about 1032.8011716911.

The spelling of 1101666557 in words is "one billion, one hundred one million, six hundred sixty-six thousand, five hundred fifty-seven".