66989047751 has 8 divisors (see below), whose sum is σ = 68224239360. Its totient is φ = 65757182392.

The previous prime is 66989047747. The next prime is 66989047777. The reversal of 66989047751 is 15774098966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66989047751 - 2² = 66989047747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66989040751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790895 + ... + 871488.

It is an arithmetic number, because the mean of its divisors is an integer number (8528029920).

Almost surely, 2^66989047751 is an apocalyptic number.

66989047751 is a deficient number, since it is larger than the sum of its proper divisors (1235191609).

66989047751 is a wasteful number, since it uses less digits than its factorization.

66989047751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663125.

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 66989047751 in words is "sixty-six billion, nine hundred eighty-nine million, forty-seven thousand, seven hundred fifty-one".