66122507747 has 4 divisors (see below), whose sum is σ = 66124631376. Its totient is φ = 66120384120.

The previous prime is 66122507741. The next prime is 66122507779. The reversal of 66122507747 is 74770522166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66122507747 - 2¹² = 66122503651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66122507741) 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, 1014404 + ... + 1077617.

It is an arithmetic number, because the mean of its divisors is an integer number (16531157844).

Almost surely, 2^66122507747 is an apocalyptic number.

66122507747 is a deficient number, since it is larger than the sum of its proper divisors (2123629).

66122507747 is a wasteful number, since it uses less digits than its factorization.

66122507747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123628.

The product of its (nonzero) digits is 987840, while the sum is 47.

The spelling of 66122507747 in words is "sixty-six billion, one hundred twenty-two million, five hundred seven thousand, seven hundred forty-seven".