1264055681 has 8 divisors (see below), whose sum is σ = 1445175360. Its totient is φ = 1083071088.

The previous prime is 1264055657. The next prime is 1264055687. The reversal of 1264055681 is 1865504621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1264055681 - 2¹⁰ = 1264054657 is a prime.

It is a super-2 number, since 2×1264055681² = 3195673529336747522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264055687) 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 in 7 ways as a sum of consecutive naturals, for example, 12851 + ... + 51896.

It is an arithmetic number, because the mean of its divisors is an integer number (180646920).

Almost surely, 2^1264055681 is an apocalyptic number.

It is an amenable number.

1264055681 is a deficient number, since it is larger than the sum of its proper divisors (181119679).

1264055681 is an equidigital number, since it uses as much as digits as its factorization.

1264055681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67543.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1264055681 is about 35553.5607358813. The cubic root of 1264055681 is about 1081.2399114031.

The spelling of 1264055681 in words is "one billion, two hundred sixty-four million, fifty-five thousand, six hundred eighty-one".