66808501809950 has 24 divisors (see below), whose sum is σ = 125494148161800. Its totient is φ = 26458812596000.

The previous prime is 66808501809949. The next prime is 66808501809997. The reversal of 66808501809950 is 5990810580866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6614698100 + ... + 6614708199.

It is an arithmetic number, because the mean of its divisors is an integer number (5228922840075).

Almost surely, 2^{66808501809950} is an apocalyptic number.

66808501809950 is a deficient number, since it is larger than the sum of its proper divisors (58685646351850).

66808501809950 is a wasteful number, since it uses less digits than its factorization.

66808501809950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13229406412 (or 13229406407 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 65.

The spelling of 66808501809950 in words is "sixty-six trillion, eight hundred eight billion, five hundred one million, eight hundred nine thousand, nine hundred fifty".