264609551 has 4 divisors (see below), whose sum is σ = 265551504. Its totient is φ = 263667600.

The previous prime is 264609529. The next prime is 264609559. The reversal of 264609551 is 155906462.

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 264609551 - 2¹⁴ = 264593167 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 (264609559) 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, 470555 + ... + 471116.

It is an arithmetic number, because the mean of its divisors is an integer number (66387876).

Almost surely, 2^264609551 is an apocalyptic number.

264609551 is a deficient number, since it is larger than the sum of its proper divisors (941953).

264609551 is an equidigital number, since it uses as much as digits as its factorization.

264609551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941952.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 264609551 is about 16266.8236297072. The cubic root of 264609551 is about 642.0002126984. Note that the first 3 decimals are identical.

The spelling of 264609551 in words is "two hundred sixty-four million, six hundred nine thousand, five hundred fifty-one".