1272161266 has 8 divisors (see below), whose sum is σ = 1920396780. Its totient is φ = 632029008.

The previous prime is 1272161249. The next prime is 1272161287. The reversal of 1272161266 is 6621612721.

It can be written as a sum of positive squares in 2 ways, for example, as 1264158025 + 8003241 = 35555^2 + 2829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025421 + ... + 2026048.

Almost surely, 2^1272161266 is an apocalyptic number.

1272161266 is a deficient number, since it is larger than the sum of its proper divisors (648235514).

1272161266 is a wasteful number, since it uses less digits than its factorization.

1272161266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051628.

The product of its digits is 12096, while the sum is 34.

The square root of 1272161266 is about 35667.3697656556. The cubic root of 1272161266 is about 1083.5460903057.

Adding to 1272161266 its reverse (6621612721), we get a palindrome (7893773987).

The spelling of 1272161266 in words is "one billion, two hundred seventy-two million, one hundred sixty-one thousand, two hundred sixty-six".