66677517 has 12 divisors (see below), whose sum is σ = 101381280. Its totient is φ = 42112008.

The previous prime is 66677503. The next prime is 66677531. The reversal of 66677517 is 71577666.

It is an interprime number because it is at equal distance from previous prime (66677503) and next prime (66677531).

It is not a de Polignac number, because 66677517 - 2¹⁸ = 66415373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194793 + ... + 195134.

It is an arithmetic number, because the mean of its divisors is an integer number (8448440).

Almost surely, 2^66677517 is an apocalyptic number.

It is an amenable number.

66677517 is a deficient number, since it is larger than the sum of its proper divisors (34703763).

66677517 is a wasteful number, since it uses less digits than its factorization.

66677517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389952 (or 389949 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 66677517 is about 8165.6302267492. The cubic root of 66677517 is about 405.5021298179.

The spelling of 66677517 in words is "sixty-six million, six hundred seventy-seven thousand, five hundred seventeen".