646105544153 has 4 divisors (see below), whose sum is σ = 646108574160. Its totient is φ = 646102514148.

The previous prime is 646105544141. The next prime is 646105544173. The reversal of 646105544153 is 351445501646.

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.

It is a cyclic number.

It is not a de Polignac number, because 646105544153 - 2¹² = 646105540057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646105544173) 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, 1168775 + ... + 1630412.

It is an arithmetic number, because the mean of its divisors is an integer number (161527143540).

Almost surely, 2^646105544153 is an apocalyptic number.

It is an amenable number.

646105544153 is a deficient number, since it is larger than the sum of its proper divisors (3030007).

646105544153 is a wasteful number, since it uses less digits than its factorization.

646105544153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030006.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 646105544153 in words is "six hundred forty-six billion, one hundred five million, five hundred forty-four thousand, one hundred fifty-three".