564778404386989 has 8 divisors (see below), whose sum is σ = 623057601838392. Its totient is φ = 508618450479360.

The previous prime is 564778404386941. The next prime is 564778404386993. The reversal of 564778404386989 is 989683404877465.

It can be written as a sum of positive squares in 4 ways, for example, as 99757946652100 + 465020457734889 = 9987890^2 + 21564333^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 564778404386989 - 2¹⁵ = 564778404354221 is a prime.

It is a super-2 number, since 2×564778404386989² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564778404386909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529810885384 + ... + 529810886449.

It is an arithmetic number, because the mean of its divisors is an integer number (77882200229799).

Almost surely, 2^{564778404386989} is an apocalyptic number.

It is an amenable number.

564778404386989 is a deficient number, since it is larger than the sum of its proper divisors (58279197451403).

564778404386989 is a wasteful number, since it uses less digits than its factorization.

564778404386989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059621771887.

The product of its (nonzero) digits is 70230343680, while the sum is 88.

The spelling of 564778404386989 in words is "five hundred sixty-four trillion, seven hundred seventy-eight billion, four hundred four million, three hundred eighty-six thousand, nine hundred eighty-nine".