1265428166 has 32 divisors (see below), whose sum is σ = 2032192800. Its totient is φ = 589881600.

The previous prime is 1265428093. The next prime is 1265428181. The reversal of 1265428166 is 6618245621.

It is a super-2 number, since 2×1265428166² = 3202616886612247112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219116 + ... + 224816.

It is an arithmetic number, because the mean of its divisors is an integer number (63506025).

Almost surely, 2^1265428166 is an apocalyptic number.

1265428166 is a deficient number, since it is larger than the sum of its proper divisors (766764634).

1265428166 is a wasteful number, since it uses less digits than its factorization.

1265428166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864.

The product of its digits is 138240, while the sum is 41.

The square root of 1265428166 is about 35572.8571526101. The cubic root of 1265428166 is about 1081.6310990204.

The spelling of 1265428166 in words is "one billion, two hundred sixty-five million, four hundred twenty-eight thousand, one hundred sixty-six".