646305601 has 4 divisors (see below), whose sum is σ = 660056832. Its totient is φ = 632554372.

The previous prime is 646305593. The next prime is 646305613. The reversal of 646305601 is 106503646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 106503646 = 2 ⋅53251823.

It is a cyclic number.

It is not a de Polignac number, because 646305601 - 2³ = 646305593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646305001) 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, 6875545 + ... + 6875638.

It is an arithmetic number, because the mean of its divisors is an integer number (165014208).

Almost surely, 2^646305601 is an apocalyptic number.

It is an amenable number.

646305601 is a deficient number, since it is larger than the sum of its proper divisors (13751231).

646305601 is a wasteful number, since it uses less digits than its factorization.

646305601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13751230.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 646305601 is about 25422.5411987079. The cubic root of 646305601 is about 864.5948411631.

The spelling of 646305601 in words is "six hundred forty-six million, three hundred five thousand, six hundred one".