66731545149 has 4 divisors (see below), whose sum is σ = 88975393536. Its totient is φ = 44487696764.

The previous prime is 66731545147. The next prime is 66731545151. The reversal of 66731545149 is 94154513766.

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 an interprime number because it is at equal distance from previous prime (66731545147) and next prime (66731545151).

It is a cyclic number.

It is not a de Polignac number, because 66731545149 - 2¹ = 66731545147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731545147) 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, 11121924189 + ... + 11121924194.

It is an arithmetic number, because the mean of its divisors is an integer number (22243848384).

Almost surely, 2^66731545149 is an apocalyptic number.

It is an amenable number.

66731545149 is a deficient number, since it is larger than the sum of its proper divisors (22243848387).

66731545149 is a wasteful number, since it uses less digits than its factorization.

66731545149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22243848386.

The product of its digits is 2721600, while the sum is 51.

The spelling of 66731545149 in words is "sixty-six billion, seven hundred thirty-one million, five hundred forty-five thousand, one hundred forty-nine".