66122507766 has 48 divisors (see below), whose sum is σ = 160524578304. Its totient is φ = 18070745616.

The previous prime is 66122507741. The next prime is 66122507779. The reversal of 66122507766 is 66770522166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4882510 + ... + 4896033.

It is an arithmetic number, because the mean of its divisors is an integer number (3344262048).

Almost surely, 2^66122507766 is an apocalyptic number.

66122507766 is an abundant number, since it is smaller than the sum of its proper divisors (94402070538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66122507766 is a wasteful number, since it uses less digits than its factorization.

66122507766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778585 (or 9778578 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 66122507766 in words is "sixty-six billion, one hundred twenty-two million, five hundred seven thousand, seven hundred sixty-six".