264506861543 has 4 divisors (see below), whose sum is σ = 265441515048. Its totient is φ = 263572208040.

The previous prime is 264506861539. The next prime is 264506861551. The reversal of 264506861543 is 345168605462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 264506861543 - 2² = 264506861539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 264506861491 and 264506861500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264506866543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467326328 + ... + 467326893.

It is an arithmetic number, because the mean of its divisors is an integer number (66360378762).

Almost surely, 2^264506861543 is an apocalyptic number.

264506861543 is a deficient number, since it is larger than the sum of its proper divisors (934653505).

264506861543 is an equidigital number, since it uses as much as digits as its factorization.

264506861543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934653504.

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 264506861543 in words is "two hundred sixty-four billion, five hundred six million, eight hundred sixty-one thousand, five hundred forty-three".