646380101 has 8 divisors (see below), whose sum is σ = 690240000. Its totient is φ = 603958320.

The previous prime is 646380083. The next prime is 646380131. The reversal of 646380101 is 101083646.

646380101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 646380101 - 2⁶ = 646380037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646380131) 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, 358601 + ... + 360398.

It is an arithmetic number, because the mean of its divisors is an integer number (86280000).

Almost surely, 2^646380101 is an apocalyptic number.

It is an amenable number.

646380101 is a deficient number, since it is larger than the sum of its proper divisors (43859899).

646380101 is a wasteful number, since it uses less digits than its factorization.

646380101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719059.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 646380101 is about 25424.0063915977. The cubic root of 646380101 is about 864.6280606600.

The spelling of 646380101 in words is "six hundred forty-six million, three hundred eighty thousand, one hundred one".