1265163206 has 4 divisors (see below), whose sum is σ = 1897744812. Its totient is φ = 632581602.

The previous prime is 1265163191. The next prime is 1265163209. The reversal of 1265163206 is 6023615621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6023615621 = 79 ⋅76248299.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265163209) by changing a digit.

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 as a sum of consecutive naturals, namely, 316290800 + ... + 316290803.

It is an arithmetic number, because the mean of its divisors is an integer number (474436203).

Almost surely, 2^1265163206 is an apocalyptic number.

1265163206 is a deficient number, since it is larger than the sum of its proper divisors (632581606).

1265163206 is an equidigital number, since it uses as much as digits as its factorization.

1265163206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632581605.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1265163206 is about 35569.1327698610. The cubic root of 1265163206 is about 1081.5556017860. Note that the first 3 decimals are identical.

Adding to 1265163206 its reverse (6023615621), we get a palindrome (7288778827).

It can be divided in two parts, 12651 and 63206, that added together give a palindrome (75857).

The spelling of 1265163206 in words is "one billion, two hundred sixty-five million, one hundred sixty-three thousand, two hundred six".