66500940381 has 8 divisors (see below), whose sum is σ = 91064350944. Its totient is φ = 43135745040.

The previous prime is 66500940347. The next prime is 66500940421. The reversal of 66500940381 is 18304900566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66500940381 - 2²⁹ = 65964069469 is a prime.

It is a super-2 number, since 2×66500940381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66500940301) 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 7 ways as a sum of consecutive naturals, for example, 299553675 + ... + 299553896.

It is an arithmetic number, because the mean of its divisors is an integer number (11383043868).

Almost surely, 2^66500940381 is an apocalyptic number.

It is an amenable number.

66500940381 is a deficient number, since it is larger than the sum of its proper divisors (24563410563).

66500940381 is a wasteful number, since it uses less digits than its factorization.

66500940381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599107611.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 66500940381 in words is "sixty-six billion, five hundred million, nine hundred forty thousand, three hundred eighty-one".