66550503634 has 16 divisors (see below), whose sum is σ = 109648428480. Its totient is φ = 30153317040.

The previous prime is 66550503623. The next prime is 66550503641. The reversal of 66550503634 is 43630505566.

It is a super-3 number, since 3×66550503634³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38071497 + ... + 38073244.

It is an arithmetic number, because the mean of its divisors is an integer number (6853026780).

Almost surely, 2^66550503634 is an apocalyptic number.

66550503634 is a deficient number, since it is larger than the sum of its proper divisors (43097924846).

66550503634 is a wasteful number, since it uses less digits than its factorization.

66550503634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76144785.

The product of its (nonzero) digits is 972000, while the sum is 43.

The spelling of 66550503634 in words is "sixty-six billion, five hundred fifty million, five hundred three thousand, six hundred thirty-four".