66557101 has 12 divisors (see below), whose sum is σ = 75208608. Its totient is φ = 58762704.

The previous prime is 66557087. The next prime is 66557107. The reversal of 66557101 is 10175566.

It is not a de Polignac number, because 66557101 - 2⁵ = 66557069 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 (66557107) 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 11 ways as a sum of consecutive naturals, for example, 4675 + ... + 12448.

It is an arithmetic number, because the mean of its divisors is an integer number (6267384).

Almost surely, 2^66557101 is an apocalyptic number.

It is an amenable number.

66557101 is a deficient number, since it is larger than the sum of its proper divisors (8651507).

66557101 is a wasteful number, since it uses less digits than its factorization.

66557101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17172 (or 17159 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 66557101 is about 8158.2535508527. The cubic root of 66557101 is about 405.2578777305.

The spelling of 66557101 in words is "sixty-six million, five hundred fifty-seven thousand, one hundred one".