66601641 has 4 divisors (see below), whose sum is σ = 88802192. Its totient is φ = 44401092.

The previous prime is 66601567. The next prime is 66601643. The reversal of 66601641 is 14610666.

66601641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-66601641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66601599 and 66601608.

It is not an unprimeable number, because it can be changed into a prime (66601643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11100271 + ... + 11100276.

It is an arithmetic number, because the mean of its divisors is an integer number (22200548).

Almost surely, 2^66601641 is an apocalyptic number.

It is an amenable number.

66601641 is a deficient number, since it is larger than the sum of its proper divisors (22200551).

66601641 is a wasteful number, since it uses less digits than its factorization.

66601641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22200550.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66601641 is about 8160.9828452215. The cubic root of 66601641 is about 405.3482570725.

The spelling of 66601641 in words is "sixty-six million, six hundred one thousand, six hundred forty-one".