1264665201 has 4 divisors (see below), whose sum is σ = 1686220272. Its totient is φ = 843110132.

The previous prime is 1264665191. The next prime is 1264665203. The reversal of 1264665201 is 1025664621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1264665201 - 2⁹ = 1264664689 is a prime.

It is a super-3 number, since 3×1264665201³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1264665203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210777531 + ... + 210777536.

It is an arithmetic number, because the mean of its divisors is an integer number (421555068).

Almost surely, 2^1264665201 is an apocalyptic number.

It is an amenable number.

1264665201 is a deficient number, since it is larger than the sum of its proper divisors (421555071).

1264665201 is an equidigital number, since it uses as much as digits as its factorization.

1264665201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421555070.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1264665201 is about 35562.1315587241. The cubic root of 1264665201 is about 1081.4136725913.

The spelling of 1264665201 in words is "one billion, two hundred sixty-four million, six hundred sixty-five thousand, two hundred one".