564621655550551 has 4 divisors (see below), whose sum is σ = 564625850216400. Its totient is φ = 564617460884704.

The previous prime is 564621655550531. The next prime is 564621655550597. The reversal of 564621655550551 is 155055556126465.

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 564621655550551 - 2²⁷ = 564621521332823 is a prime.

It is a super-2 number, since 2×564621655550551² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 564621655550551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564621655550521) 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, 2097131011 + ... + 2097400228.

It is an arithmetic number, because the mean of its divisors is an integer number (141156462554100).

Almost surely, 2^{564621655550551} is an apocalyptic number.

564621655550551 is a deficient number, since it is larger than the sum of its proper divisors (4194665849).

564621655550551 is a wasteful number, since it uses less digits than its factorization.

564621655550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194665848.

The product of its (nonzero) digits is 135000000, while the sum is 61.

The spelling of 564621655550551 in words is "five hundred sixty-four trillion, six hundred twenty-one billion, six hundred fifty-five million, five hundred fifty thousand, five hundred fifty-one".