66533015776 has 24 divisors (see below), whose sum is σ = 131508750744. Its totient is φ = 33133968000.

The previous prime is 66533015737. The next prime is 66533015779. The reversal of 66533015776 is 67751033566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66533015779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4133715 + ... + 4149778.

It is an arithmetic number, because the mean of its divisors is an integer number (5479531281).

Almost surely, 2^66533015776 is an apocalyptic number.

It is an amenable number.

66533015776 is a deficient number, since it is larger than the sum of its proper divisors (64975734968).

66533015776 is a wasteful number, since it uses less digits than its factorization.

66533015776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8283754 (or 8283746 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 49.

The spelling of 66533015776 in words is "sixty-six billion, five hundred thirty-three million, fifteen thousand, seven hundred seventy-six".