66536842563 has 12 divisors (see below), whose sum is σ = 96118878960. Its totient is φ = 44353230576.

The previous prime is 66536842553. The next prime is 66536842573. The reversal of 66536842563 is 36524863566.

66536842563 is a `hidden beast` number, since 6 + 6 + 5 + 36 + 8 + 42 + 563 = 666.

It is an interprime number because it is at equal distance from previous prime (66536842553) and next prime (66536842573).

It is not a de Polignac number, because 66536842563 - 2⁶ = 66536842499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66536842523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297231 + ... + 470552.

It is an arithmetic number, because the mean of its divisors is an integer number (8009906580).

Almost surely, 2^66536842563 is an apocalyptic number.

66536842563 is a deficient number, since it is larger than the sum of its proper divisors (29582036397).

66536842563 is a wasteful number, since it uses less digits than its factorization.

66536842563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777418 (or 777415 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The spelling of 66536842563 in words is "sixty-six billion, five hundred thirty-six million, eight hundred forty-two thousand, five hundred sixty-three".