1264643455 has 32 divisors (see below), whose sum is σ = 1605484800. Its totient is φ = 954949632.

The previous prime is 1264643449. The next prime is 1264643467. The reversal of 1264643455 is 5543464621.

It is a cyclic number.

It is not a de Polignac number, because 1264643455 - 2⁵ = 1264643423 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1293927 + ... + 1294903.

It is an arithmetic number, because the mean of its divisors is an integer number (50171400).

Almost surely, 2^1264643455 is an apocalyptic number.

1264643455 is a deficient number, since it is larger than the sum of its proper divisors (340841345).

1264643455 is a wasteful number, since it uses less digits than its factorization.

1264643455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203.

The product of its digits is 345600, while the sum is 40.

The square root of 1264643455 is about 35561.8258108326. The cubic root of 1264643455 is about 1081.4074742297.

The spelling of 1264643455 in words is "one billion, two hundred sixty-four million, six hundred forty-three thousand, four hundred fifty-five".