66515750608 has 20 divisors (see below), whose sum is σ = 128879438688. Its totient is φ = 33256540640.

The previous prime is 66515750569. The next prime is 66515750671. The reversal of 66515750608 is 80605751566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419685 + ... + 556027.

Almost surely, 2^66515750608 is an apocalyptic number.

It is an amenable number.

66515750608 is a deficient number, since it is larger than the sum of its proper divisors (62363688080).

66515750608 is a wasteful number, since it uses less digits than its factorization.

66515750608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166842 (or 166836 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 49.

The spelling of 66515750608 in words is "sixty-six billion, five hundred fifteen million, seven hundred fifty thousand, six hundred eight".