646220041 has 8 divisors (see below), whose sum is σ = 650456064. Its totient is φ = 641993280.

The previous prime is 646220009. The next prime is 646220089. The reversal of 646220041 is 140022646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646220041 - 2⁵ = 646220009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646219988 and 646220015.

It is not an unprimeable number, because it can be changed into a prime (646220741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184876 + ... + 188338.

It is an arithmetic number, because the mean of its divisors is an integer number (81307008).

Almost surely, 2^646220041 is an apocalyptic number.

It is an amenable number.

646220041 is a deficient number, since it is larger than the sum of its proper divisors (4236023).

646220041 is a wasteful number, since it uses less digits than its factorization.

646220041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 646220041 is about 25420.8583844055. The cubic root of 646220041 is about 864.5566868704.

Adding to 646220041 its reverse (140022646), we get a palindrome (786242687).

The spelling of 646220041 in words is "six hundred forty-six million, two hundred twenty thousand, forty-one".