264555261643 has 4 divisors (see below), whose sum is σ = 265926014488. Its totient is φ = 263184508800.

The previous prime is 264555261631. The next prime is 264555261647. The reversal of 264555261643 is 346162555462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346162555462 = 2 ⋅173081277731.

It is a cyclic number.

It is not a de Polignac number, because 264555261643 - 2⁵ = 264555261611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264555261647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685376133 + ... + 685376518.

It is an arithmetic number, because the mean of its divisors is an integer number (66481503622).

Almost surely, 2^264555261643 is an apocalyptic number.

264555261643 is a deficient number, since it is larger than the sum of its proper divisors (1370752845).

264555261643 is a wasteful number, since it uses less digits than its factorization.

264555261643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370752844.

The product of its digits is 5184000, while the sum is 49.

The spelling of 264555261643 in words is "two hundred sixty-four billion, five hundred fifty-five million, two hundred sixty-one thousand, six hundred forty-three".