1017125666 has 4 divisors (see below), whose sum is σ = 1525688502. Its totient is φ = 508562832.

The previous prime is 1017125609. The next prime is 1017125737. The reversal of 1017125666 is 6665217101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6665217101 = 11959 ⋅557339.

It can be written as a sum of positive squares in only one way, i.e., 977875441 + 39250225 = 31271^2 + 6265^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254281415 + ... + 254281418.

Almost surely, 2^1017125666 is an apocalyptic number.

1017125666 is a deficient number, since it is larger than the sum of its proper divisors (508562836).

1017125666 is an equidigital number, since it uses as much as digits as its factorization.

1017125666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508562835.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1017125666 is about 31892.4076544873. The cubic root of 1017125666 is about 1005.6762742803.

The spelling of 1017125666 in words is "one billion, seventeen million, one hundred twenty-five thousand, six hundred sixty-six".