66201651 has 8 divisors (see below), whose sum is σ = 98076560. Its totient is φ = 44134416.

The previous prime is 66201631. The next prime is 66201677. The reversal of 66201651 is 15610266.

It is a happy number.

66201651 is a `hidden beast` number, since 6 + 6 + 2 + 0 + 1 + 651 = 666.

66201651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66201651 - 2¹⁰ = 66200627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2451913 = 66201651 / (6 + 6 + 2 + 0 + 1 + 6 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66201601) 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 7 ways as a sum of consecutive naturals, for example, 1225930 + ... + 1225983.

It is an arithmetic number, because the mean of its divisors is an integer number (12259570).

Almost surely, 2^66201651 is an apocalyptic number.

66201651 is a deficient number, since it is larger than the sum of its proper divisors (31874909).

66201651 is a wasteful number, since it uses less digits than its factorization.

66201651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2451922 (or 2451916 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 66201651 is about 8136.4397005078. The cubic root of 66201651 is about 404.5351594110.

The spelling of 66201651 in words is "sixty-six million, two hundred one thousand, six hundred fifty-one".