646446061 has 4 divisors (see below), whose sum is σ = 646695324. Its totient is φ = 646196800.

The previous prime is 646446041. The next prime is 646446089. The reversal of 646446061 is 160644646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 601475625 + 44970436 = 24525^2 + 6706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646446061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646446061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646446041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120700 + ... + 125941.

It is an arithmetic number, because the mean of its divisors is an integer number (161673831).

Almost surely, 2^646446061 is an apocalyptic number.

It is an amenable number.

646446061 is a deficient number, since it is larger than the sum of its proper divisors (249263).

646446061 is a wasteful number, since it uses less digits than its factorization.

646446061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249262.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 646446061 is about 25425.3035576766. The cubic root of 646446061 is about 864.6574700468.

It can be divided in two parts, 6464 and 46061, that added together give a palindrome (52525).

The spelling of 646446061 in words is "six hundred forty-six million, four hundred forty-six thousand, sixty-one".