66380698613 has 4 divisors (see below), whose sum is σ = 69266815968. Its totient is φ = 63494581260.

The previous prime is 66380698577. The next prime is 66380698649. The reversal of 66380698613 is 31689608366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (66380698577) and next prime (66380698649).

It is a cyclic number.

It is not a de Polignac number, because 66380698613 - 2²⁰ = 66379650037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66380698663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1443058643 + ... + 1443058688.

It is an arithmetic number, because the mean of its divisors is an integer number (17316703992).

Almost surely, 2^66380698613 is an apocalyptic number.

It is an amenable number.

66380698613 is a deficient number, since it is larger than the sum of its proper divisors (2886117355).

66380698613 is a wasteful number, since it uses less digits than its factorization.

66380698613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2886117354.

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 66380698613 in words is "sixty-six billion, three hundred eighty million, six hundred ninety-eight thousand, six hundred thirteen".