66201861 has 16 divisors (see below), whose sum is σ = 96441408. Its totient is φ = 40060800.

The previous prime is 66201857. The next prime is 66201869. The reversal of 66201861 is 16810266.

It is not a de Polignac number, because 66201861 - 2² = 66201857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66201869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29851 + ... + 31991.

It is an arithmetic number, because the mean of its divisors is an integer number (6027588).

Almost surely, 2^66201861 is an apocalyptic number.

It is an amenable number.

66201861 is a deficient number, since it is larger than the sum of its proper divisors (30239547).

66201861 is a wasteful number, since it uses less digits than its factorization.

66201861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 66201861 is about 8136.4526054049. The cubic root of 66201861 is about 404.5355871561.

The spelling of 66201861 in words is "sixty-six million, two hundred one thousand, eight hundred sixty-one".