66945605703 has 4 divisors (see below), whose sum is σ = 89260807608. Its totient is φ = 44630403800.

The previous prime is 66945605653. The next prime is 66945605747. The reversal of 66945605703 is 30750654966.

It is a happy number.

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 66945605703 - 2¹² = 66945601607 is a prime.

It is a super-2 number, since 2×66945605703² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66945605203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11157600948 + ... + 11157600953.

It is an arithmetic number, because the mean of its divisors is an integer number (22315201902).

Almost surely, 2^66945605703 is an apocalyptic number.

66945605703 is a deficient number, since it is larger than the sum of its proper divisors (22315201905).

66945605703 is a wasteful number, since it uses less digits than its factorization.

66945605703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22315201904.

The product of its (nonzero) digits is 4082400, while the sum is 51.

The spelling of 66945605703 in words is "sixty-six billion, nine hundred forty-five million, six hundred five thousand, seven hundred three".