66880512867 has 32 divisors (see below), whose sum is σ = 107557355520. Its totient is φ = 36111376800.

The previous prime is 66880512847. The next prime is 66880512877. The reversal of 66880512867 is 76821508866.

It is a happy number.

It is not a de Polignac number, because 66880512867 - 2¹⁶ = 66880447331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (66880512847) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 66009 + ... + 371642.

It is an arithmetic number, because the mean of its divisors is an integer number (3361167360).

Almost surely, 2^66880512867 is an apocalyptic number.

66880512867 is a deficient number, since it is larger than the sum of its proper divisors (40676842653).

66880512867 is a wasteful number, since it uses less digits than its factorization.

66880512867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438063.

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 66880512867 in words is "sixty-six billion, eight hundred eighty million, five hundred twelve thousand, eight hundred sixty-seven".