66477657 has 8 divisors (see below), whose sum is σ = 91693440. Its totient is φ = 42790160.

The previous prime is 66477643. The next prime is 66477661. The reversal of 66477657 is 75677466.

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

It is a cyclic number.

It is not a de Polignac number, because 66477657 - 2⁸ = 66477401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66472657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381969 + ... + 382142.

It is an arithmetic number, because the mean of its divisors is an integer number (11461680).

Almost surely, 2^66477657 is an apocalyptic number.

It is an amenable number.

66477657 is a deficient number, since it is larger than the sum of its proper divisors (25215783).

66477657 is a wasteful number, since it uses less digits than its factorization.

66477657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764143.

The product of its digits is 1481760, while the sum is 48.

The square root of 66477657 is about 8153.3831628349. The cubic root of 66477657 is about 405.0965720019.

The spelling of 66477657 in words is "sixty-six million, four hundred seventy-seven thousand, six hundred fifty-seven".