646026721153 has 16 divisors (see below), whose sum is σ = 735855523200. Its totient is φ = 561412874880.

The previous prime is 646026721147. The next prime is 646026721157. The reversal of 646026721153 is 351127620646.

It is not a de Polignac number, because 646026721153 - 2⁹ = 646026720641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646026721157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386418 + ... + 1200571.

It is an arithmetic number, because the mean of its divisors is an integer number (45990970200).

Almost surely, 2^646026721153 is an apocalyptic number.

It is an amenable number.

646026721153 is a deficient number, since it is larger than the sum of its proper divisors (89828802047).

646026721153 is a wasteful number, since it uses less digits than its factorization.

646026721153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588632.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 646026721153 in words is "six hundred forty-six billion, twenty-six million, seven hundred twenty-one thousand, one hundred fifty-three".