1265354166 has 16 divisors (see below), whose sum is σ = 2679573744. Its totient is φ = 396973824.

The previous prime is 1265354147. The next prime is 1265354201. The reversal of 1265354166 is 6614535621.

It is a super-2 number, since 2×1265354166² = 3202242330827111112, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6202615 + ... + 6202818.

It is an arithmetic number, because the mean of its divisors is an integer number (167473359).

Almost surely, 2^1265354166 is an apocalyptic number.

1265354166 is an abundant number, since it is smaller than the sum of its proper divisors (1414219578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265354166 is a wasteful number, since it uses less digits than its factorization.

1265354166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12405455.

The product of its digits is 129600, while the sum is 39.

The square root of 1265354166 is about 35571.8170185331. The cubic root of 1265354166 is about 1081.6100146518.

Adding to 1265354166 its reverse (6614535621), we get a palindrome (7879889787).

The spelling of 1265354166 in words is "one billion, two hundred sixty-five million, three hundred fifty-four thousand, one hundred sixty-six".