1266123201 has 48 divisors (see below), whose sum is σ = 2015129664. Its totient is φ = 704785536.

The previous prime is 1266123149. The next prime is 1266123211. The reversal of 1266123201 is 1023216621.

It is not a de Polignac number, because 1266123201 - 2⁷ = 1266123073 is a prime.

It is a super-2 number, since 2×1266123201² = 3206135920220972802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1266123211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1269435 + ... + 1270431.

It is an arithmetic number, because the mean of its divisors is an integer number (41981868).

Almost surely, 2^1266123201 is an apocalyptic number.

It is an amenable number.

1266123201 is a deficient number, since it is larger than the sum of its proper divisors (749006463).

1266123201 is a wasteful number, since it uses less digits than its factorization.

1266123201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230 (or 1223 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1266123201 is about 35582.6249874851. The cubic root of 1266123201 is about 1081.8290909983.

Adding to 1266123201 its reverse (1023216621), we get a palindrome (2289339822).

The spelling of 1266123201 in words is "one billion, two hundred sixty-six million, one hundred twenty-three thousand, two hundred one".