66500940379 has 4 divisors (see below), whose sum is σ = 66501858960. Its totient is φ = 66500021800.

The previous prime is 66500940347. The next prime is 66500940421. The reversal of 66500940379 is 97304900566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97304900566 = 2 ⋅48652450283.

It is a cyclic number.

It is not a de Polignac number, because 66500940379 - 2⁵ = 66500940347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66500940679) 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 3 ways as a sum of consecutive naturals, for example, 340447 + ... + 498904.

It is an arithmetic number, because the mean of its divisors is an integer number (16625464740).

Almost surely, 2^66500940379 is an apocalyptic number.

66500940379 is a deficient number, since it is larger than the sum of its proper divisors (918581).

66500940379 is an equidigital number, since it uses as much as digits as its factorization.

66500940379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918580.

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 66500940379 in words is "sixty-six billion, five hundred million, nine hundred forty thousand, three hundred seventy-nine".