66697009101 has 6 divisors (see below), whose sum is σ = 96340124270. Its totient is φ = 44464672728.

The previous prime is 66697009091. The next prime is 66697009111. The reversal of 66697009101 is 10190079666.

It is an interprime number because it is at equal distance from previous prime (66697009091) and next prime (66697009111).

It can be written as a sum of positive squares in only one way, i.e., 58619673225 + 8077335876 = 242115^2 + 89874^2 .

It is not a de Polignac number, because 66697009101 - 2⁵ = 66697009069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66697009111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3705389386 + ... + 3705389403.

Almost surely, 2^66697009101 is an apocalyptic number.

It is an amenable number.

66697009101 is a deficient number, since it is larger than the sum of its proper divisors (29643115169).

66697009101 is a wasteful number, since it uses less digits than its factorization.

66697009101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410778795 (or 7410778792 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 66697009101 in words is "sixty-six billion, six hundred ninety-seven million, nine thousand, one hundred one".