66620736063 has 20 divisors (see below), whose sum is σ = 113736989520. Its totient is φ = 38068991712.

The previous prime is 66620735897. The next prime is 66620736067. The reversal of 66620736063 is 36063702666.

It is not a de Polignac number, because 66620736063 - 2⁸ = 66620735807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66620736067) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 58747878 + ... + 58749011.

It is an arithmetic number, because the mean of its divisors is an integer number (5686849476).

Almost surely, 2^66620736063 is an apocalyptic number.

66620736063 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

66620736063 is a deficient number, since it is larger than the sum of its proper divisors (47116253457).

66620736063 is a wasteful number, since it uses less digits than its factorization.

66620736063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117496908 (or 117496899 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 45.

The spelling of 66620736063 in words is "sixty-six billion, six hundred twenty million, seven hundred thirty-six thousand, sixty-three".