66411842517 has 32 divisors (see below), whose sum is σ = 101344763520. Its totient is φ = 42955920000.

The previous prime is 66411842513. The next prime is 66411842521. The reversal of 66411842517 is 71524811466.

It is an interprime number because it is at equal distance from previous prime (66411842513) and next prime (66411842521).

It is not a de Polignac number, because 66411842517 - 2² = 66411842513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66411842513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34642 + ... + 366092.

It is an arithmetic number, because the mean of its divisors is an integer number (3167023860).

Almost surely, 2^66411842517 is an apocalyptic number.

It is an amenable number.

66411842517 is a deficient number, since it is larger than the sum of its proper divisors (34932921003).

66411842517 is a wasteful number, since it uses less digits than its factorization.

66411842517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331682 (or 331676 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 66411842517 in words is "sixty-six billion, four hundred eleven million, eight hundred forty-two thousand, five hundred seventeen".