66122507775 has 24 divisors (see below), whose sum is σ = 113092292880. Its totient is φ = 34049290240.

The previous prime is 66122507741. The next prime is 66122507779. The reversal of 66122507775 is 57770522166.

It is not a de Polignac number, because 66122507775 - 2¹² = 66122503679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66122507779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15198402 + ... + 15202751.

It is an arithmetic number, because the mean of its divisors is an integer number (4712178870).

Almost surely, 2^66122507775 is an apocalyptic number.

66122507775 is a deficient number, since it is larger than the sum of its proper divisors (46969785105).

66122507775 is a wasteful number, since it uses less digits than its factorization.

66122507775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30401195 (or 30401190 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 66122507775 in words is "sixty-six billion, one hundred twenty-two million, five hundred seven thousand, seven hundred seventy-five".