66139743255 has 16 divisors (see below), whose sum is σ = 109237254144. Its totient is φ = 34136641440.

The previous prime is 66139743233. The next prime is 66139743277. The reversal of 66139743255 is 55234793166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66139743233) and next prime (66139743277).

It is not a de Polignac number, because 66139743255 - 2¹¹ = 66139741207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66139743198 and 66139743207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71117539 + ... + 71118468.

It is an arithmetic number, because the mean of its divisors is an integer number (6827328384).

Almost surely, 2^66139743255 is an apocalyptic number.

66139743255 is a deficient number, since it is larger than the sum of its proper divisors (43097510889).

66139743255 is a wasteful number, since it uses less digits than its factorization.

66139743255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142236046.

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

The spelling of 66139743255 in words is "sixty-six billion, one hundred thirty-nine million, seven hundred forty-three thousand, two hundred fifty-five".