66706657624 has 16 divisors (see below), whose sum is σ = 125082013320. Its totient is φ = 33351454080.

The previous prime is 66706657621. The next prime is 66706657631. The reversal of 66706657624 is 42675660766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706657621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76897 + ... + 373264.

Almost surely, 2^66706657624 is an apocalyptic number.

It is an amenable number.

66706657624 is a deficient number, since it is larger than the sum of its proper divisors (58375355696).

66706657624 is a wasteful number, since it uses less digits than its factorization.

66706657624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468690 (or 468686 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 55.

The spelling of 66706657624 in words is "sixty-six billion, seven hundred six million, six hundred fifty-seven thousand, six hundred twenty-four".