2641563647 has 4 divisors (see below), whose sum is σ = 2667210000. Its totient is φ = 2615917296.
The previous prime is 2641563583. The next prime is 2641563667. The reversal of 2641563647 is 7463651462.
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 2641563647 - 26 = 2641563583 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 2641563598 and 2641563607.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2641563667) 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, 12823022 + ... + 12823227.
It is an arithmetic number, because the mean of its divisors is an integer number (666802500).
Almost surely, 22641563647 is an apocalyptic number.
2641563647 is a deficient number, since it is larger than the sum of its proper divisors (25646353).
2641563647 is a wasteful number, since it uses less digits than its factorization.
2641563647 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 25646352.
The product of its digits is 725760, while the sum is 44.
The square root of 2641563647 is about 51396.1442814536. The cubic root of 2641563647 is about 1382.3574573641.
The spelling of 2641563647 in words is "two billion, six hundred forty-one million, five hundred sixty-three thousand, six hundred forty-seven".
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