64542006563 has 8 divisors (see below), whose sum is σ = 65049296400. Its totient is φ = 64034938240.

The previous prime is 64542006559. The next prime is 64542006583. The reversal of 64542006563 is 36560024546.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64542006563 - 2² = 64542006559 is a prime.

It is a super-2 number, since 2×64542006563² (a number of 22 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 64542006563.

It is not an unprimeable number, because it can be changed into a prime (64542006583) 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, 556031 + ... + 662007.

It is an arithmetic number, because the mean of its divisors is an integer number (8131162050).

Almost surely, 2^64542006563 is an apocalyptic number.

64542006563 is a deficient number, since it is larger than the sum of its proper divisors (507289837).

64542006563 is a wasteful number, since it uses less digits than its factorization.

64542006563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110757.

The product of its (nonzero) digits is 518400, while the sum is 41.

The spelling of 64542006563 in words is "sixty-four billion, five hundred forty-two million, six thousand, five hundred sixty-three".