66607501011 has 4 divisors (see below), whose sum is σ = 88810001352. Its totient is φ = 44405000672.

The previous prime is 66607501003. The next prime is 66607501073. The reversal of 66607501011 is 11010570666.

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 66607501011 - 2³ = 66607501003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66607501711) 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, 11101250166 + ... + 11101250171.

It is an arithmetic number, because the mean of its divisors is an integer number (22202500338).

Almost surely, 2^66607501011 is an apocalyptic number.

66607501011 is a deficient number, since it is larger than the sum of its proper divisors (22202500341).

66607501011 is a wasteful number, since it uses less digits than its factorization.

66607501011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22202500340.

The product of its (nonzero) digits is 7560, while the sum is 33.

The spelling of 66607501011 in words is "sixty-six billion, six hundred seven million, five hundred one thousand, eleven".