66915500551966 has 16 divisors (see below), whose sum is σ = 110017040122368. Its totient is φ = 30271984306200.

The previous prime is 66915500551951. The next prime is 66915500552029.

66915500551966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66915500551898 and 66915500551907.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7207610670 + ... + 7207619953.

It is an arithmetic number, because the mean of its divisors is an integer number (6876065007648).

Almost surely, 2^{66915500551966} is an apocalyptic number.

66915500551966 is a deficient number, since it is larger than the sum of its proper divisors (43101539570402).

66915500551966 is a wasteful number, since it uses less digits than its factorization.

66915500551966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14415230847.

The product of its (nonzero) digits is 65610000, while the sum is 64.

The spelling of 66915500551966 in words is "sixty-six trillion, nine hundred fifteen billion, five hundred million, five hundred fifty-one thousand, nine hundred sixty-six".