564778404376631 has 4 divisors (see below), whose sum is σ = 566484683544264. Its totient is φ = 563072125209000.

The previous prime is 564778404376601. The next prime is 564778404376687. The reversal of 564778404376631 is 136673404877465.

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 564778404376631 - 2¹⁸ = 564778404114487 is a prime.

It is a super-2 number, since 2×564778404376631² (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 (564778404376601) 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, 853139583320 + ... + 853139583981.

It is an arithmetic number, because the mean of its divisors is an integer number (141621170886066).

Almost surely, 2^{564778404376631} is an apocalyptic number.

564778404376631 is a deficient number, since it is larger than the sum of its proper divisors (1706279167633).

564778404376631 is a wasteful number, since it uses less digits than its factorization.

564778404376631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706279167632.

The product of its (nonzero) digits is 1706987520, while the sum is 71.

The spelling of 564778404376631 in words is "five hundred sixty-four trillion, seven hundred seventy-eight billion, four hundred four million, three hundred seventy-six thousand, six hundred thirty-one".