66910557 has 8 divisors (see below), whose sum is σ = 101958976. Its totient is φ = 38234592.

The previous prime is 66910523. The next prime is 66910573. The reversal of 66910557 is 75501966.

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

It is not a de Polignac number, because 66910557 - 2¹² = 66906461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66910507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1593088 + ... + 1593129.

It is an arithmetic number, because the mean of its divisors is an integer number (12744872).

Almost surely, 2^66910557 is an apocalyptic number.

It is an amenable number.

66910557 is a deficient number, since it is larger than the sum of its proper divisors (35048419).

66910557 is a wasteful number, since it uses less digits than its factorization.

66910557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3186227.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 66910557 is about 8179.8873464125. The cubic root of 66910557 is about 405.9739947105.

The spelling of 66910557 in words is "sixty-six million, nine hundred ten thousand, five hundred fifty-seven".