66125386406 has 4 divisors (see below), whose sum is σ = 99188079612. Its totient is φ = 33062693202.

The previous prime is 66125386381. The next prime is 66125386417. The reversal of 66125386406 is 60468352166.

It is a happy number.

66125386406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60468352166 = 2 ⋅30234176083.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16531346600 + ... + 16531346603.

It is an arithmetic number, because the mean of its divisors is an integer number (24797019903).

Almost surely, 2^66125386406 is an apocalyptic number.

66125386406 is a deficient number, since it is larger than the sum of its proper divisors (33062693206).

66125386406 is a wasteful number, since it uses less digits than its factorization.

66125386406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33062693205.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 66125386406 in words is "sixty-six billion, one hundred twenty-five million, three hundred eighty-six thousand, four hundred six".