66120900686 has 8 divisors (see below), whose sum is σ = 99182520360. Its totient is φ = 33060060568.

The previous prime is 66120900617. The next prime is 66120900689. The reversal of 66120900686 is 68600902166.

66120900686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66120900689) 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, 116960 + ... + 381996.

It is an arithmetic number, because the mean of its divisors is an integer number (12397815045).

Almost surely, 2^66120900686 is an apocalyptic number.

66120900686 is a deficient number, since it is larger than the sum of its proper divisors (33061619674).

66120900686 is a wasteful number, since it uses less digits than its factorization.

66120900686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389778.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 66120900686 in words is "sixty-six billion, one hundred twenty million, nine hundred thousand, six hundred eighty-six".