66231389875 has 64 divisors (see below), whose sum is σ = 99656294400. Its totient is φ = 42930518400.

The previous prime is 66231389843. The next prime is 66231389879. The reversal of 66231389875 is 57898313266.

It is not a de Polignac number, because 66231389875 - 2⁵ = 66231389843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66231389879) 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 63 ways as a sum of consecutive naturals, for example, 7959217 + ... + 7967533.

It is an arithmetic number, because the mean of its divisors is an integer number (1557129600).

Almost surely, 2^66231389875 is an apocalyptic number.

66231389875 is a deficient number, since it is larger than the sum of its proper divisors (33424904525).

66231389875 is a wasteful number, since it uses less digits than its factorization.

66231389875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8837 (or 8827 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 58.

The spelling of 66231389875 in words is "sixty-six billion, two hundred thirty-one million, three hundred eighty-nine thousand, eight hundred seventy-five".