646242105601 has 4 divisors (see below), whose sum is σ = 646309131952. Its totient is φ = 646175079252.

The previous prime is 646242105571. The next prime is 646242105623. The reversal of 646242105601 is 106501242646.

646242105601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 106501242646 = 2 ⋅53250621323.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646242105601 is a prime.

It is a super-2 number, since 2×646242105601² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646272105601) 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, 33498711 + ... + 33517996.

It is an arithmetic number, because the mean of its divisors is an integer number (161577282988).

Almost surely, 2^646242105601 is an apocalyptic number.

It is an amenable number.

646242105601 is a deficient number, since it is larger than the sum of its proper divisors (67026351).

646242105601 is an equidigital number, since it uses as much as digits as its factorization.

646242105601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67026350.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 646242105601 in words is "six hundred forty-six billion, two hundred forty-two million, one hundred five thousand, six hundred one".