646654801 has 4 divisors (see below), whose sum is σ = 696397492. Its totient is φ = 596912112.

The previous prime is 646654793. The next prime is 646654819. The reversal of 646654801 is 108456646.

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 182898576 + 463756225 = 13524^2 + 21535^2 .

It is a cyclic number.

It is not a de Polignac number, because 646654801 - 2³ = 646654793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646654831) 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, 24871326 + ... + 24871351.

It is an arithmetic number, because the mean of its divisors is an integer number (174099373).

Almost surely, 2^646654801 is an apocalyptic number.

It is an amenable number.

646654801 is a deficient number, since it is larger than the sum of its proper divisors (49742691).

646654801 is a wasteful number, since it uses less digits than its factorization.

646654801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49742690.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 646654801 is about 25429.4081920913. The cubic root of 646654801 is about 864.7505271415.

The spelling of 646654801 in words is "six hundred forty-six million, six hundred fifty-four thousand, eight hundred one".