1264450655999 has 16 divisors (see below), whose sum is σ = 1315486013184. Its totient is φ = 1214749771200.

The previous prime is 1264450655959. The next prime is 1264450656031. The reversal of 1264450655999 is 9995560544621.

It is a cyclic number.

It is not a de Polignac number, because 1264450655999 - 2²⁰ = 1264449607423 is a prime.

It is a super-2 number, since 2×1264450655999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264450655959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039457 + ... + 1899834.

It is an arithmetic number, because the mean of its divisors is an integer number (82217875824).

Almost surely, 2^{1264450655999} is an apocalyptic number.

1264450655999 is a deficient number, since it is larger than the sum of its proper divisors (51035357185).

1264450655999 is an equidigital number, since it uses as much as digits as its factorization.

1264450655999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939518.

The product of its (nonzero) digits is 104976000, while the sum is 65.

The spelling of 1264450655999 in words is "one trillion, two hundred sixty-four billion, four hundred fifty million, six hundred fifty-five thousand, nine hundred ninety-nine".