646242121051 has 16 divisors (see below), whose sum is σ = 669802867200. Its totient is φ = 623109062368.

The previous prime is 646242121039. The next prime is 646242121067. The reversal of 646242121051 is 150121242646.

646242121051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646242121051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646242120998 and 646242121016.

It is not an unprimeable number, because it can be changed into a prime (646242121081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10623360 + ... + 10684018.

It is an arithmetic number, because the mean of its divisors is an integer number (41862679200).

Almost surely, 2^646242121051 is an apocalyptic number.

646242121051 is a deficient number, since it is larger than the sum of its proper divisors (23560746149).

646242121051 is a wasteful number, since it uses less digits than its factorization.

646242121051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64178.

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 646242121051 its reverse (150121242646), we get a palindrome (796363363697).

The spelling of 646242121051 in words is "six hundred forty-six billion, two hundred forty-two million, one hundred twenty-one thousand, fifty-one".