66979675149 has 4 divisors (see below), whose sum is σ = 89306233536. Its totient is φ = 44653116764.

The previous prime is 66979675099. The next prime is 66979675151. The reversal of 66979675149 is 94157697966.

66979675149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66979675149 - 2¹⁵ = 66979642381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66979675199) 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, 11163279189 + ... + 11163279194.

It is an arithmetic number, because the mean of its divisors is an integer number (22326558384).

Almost surely, 2^66979675149 is an apocalyptic number.

It is an amenable number.

66979675149 is a deficient number, since it is larger than the sum of its proper divisors (22326558387).

66979675149 is a wasteful number, since it uses less digits than its factorization.

66979675149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22326558386.

The product of its digits is 154314720, while the sum is 69.

The spelling of 66979675149 in words is "sixty-six billion, nine hundred seventy-nine million, six hundred seventy-five thousand, one hundred forty-nine".