1125721521166 has 48 divisors (see below), whose sum is σ = 1955883444480. Its totient is φ = 484226542800.

The previous prime is 1125721521151. The next prime is 1125721521191. The reversal of 1125721521166 is 6611251275211.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4054405 + ... + 4323151.

It is an arithmetic number, because the mean of its divisors is an integer number (40747571760).

Almost surely, 2^{1125721521166} is an apocalyptic number.

1125721521166 is a deficient number, since it is larger than the sum of its proper divisors (830161923314).

1125721521166 is a wasteful number, since it uses less digits than its factorization.

1125721521166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269701 (or 269690 counting only the distinct ones).

The product of its digits is 50400, while the sum is 40.

Adding to 1125721521166 its reverse (6611251275211), we get a palindrome (7736972796377).

The spelling of 1125721521166 in words is "one trillion, one hundred twenty-five billion, seven hundred twenty-one million, five hundred twenty-one thousand, one hundred sixty-six".