66706737407 has 4 divisors (see below), whose sum is σ = 66710369256. Its totient is φ = 66703105560.

The previous prime is 66706737343. The next prime is 66706737421. The reversal of 66706737407 is 70473760766.

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 66706737407 - 2⁶ = 66706737343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706727407) 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, 1788233 + ... + 1825154.

It is an arithmetic number, because the mean of its divisors is an integer number (16677592314).

Almost surely, 2^66706737407 is an apocalyptic number.

66706737407 is a deficient number, since it is larger than the sum of its proper divisors (3631849).

66706737407 is a wasteful number, since it uses less digits than its factorization.

66706737407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631848.

The product of its (nonzero) digits is 6223392, while the sum is 53.

The spelling of 66706737407 in words is "sixty-six billion, seven hundred six million, seven hundred thirty-seven thousand, four hundred seven".