264867546821 has 4 divisors (see below), whose sum is σ = 265085905452. Its totient is φ = 264649188192.

The previous prime is 264867546809. The next prime is 264867546841. The reversal of 264867546821 is 128645768462.

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

It can be written as a sum of positive squares in 2 ways, for example, as 132506920225 + 132360626596 = 364015^2 + 363814^2 .

It is a cyclic number.

It is not a de Polignac number, because 264867546821 - 2¹⁰ = 264867545797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264867546841) 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, 109177496 + ... + 109179921.

It is an arithmetic number, because the mean of its divisors is an integer number (66271476363).

Almost surely, 2^264867546821 is an apocalyptic number.

It is an amenable number.

264867546821 is a deficient number, since it is larger than the sum of its proper divisors (218358631).

264867546821 is a wasteful number, since it uses less digits than its factorization.

264867546821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218358630.

The product of its digits is 30965760, while the sum is 59.

The spelling of 264867546821 in words is "two hundred sixty-four billion, eight hundred sixty-seven million, five hundred forty-six thousand, eight hundred twenty-one".