644034653153 has 4 divisors (see below), whose sum is σ = 645266077488. Its totient is φ = 642803228820.

The previous prime is 644034653081. The next prime is 644034653201. The reversal of 644034653153 is 351356430446.

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 644034653153 - 2⁸ = 644034652897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644034653453) 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, 615711383 + ... + 615712428.

It is an arithmetic number, because the mean of its divisors is an integer number (161316519372).

Almost surely, 2^644034653153 is an apocalyptic number.

It is an amenable number.

644034653153 is a deficient number, since it is larger than the sum of its proper divisors (1231424335).

644034653153 is a wasteful number, since it uses less digits than its factorization.

644034653153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231424334.

The product of its (nonzero) digits is 1555200, while the sum is 44.

The spelling of 644034653153 in words is "six hundred forty-four billion, thirty-four million, six hundred fifty-three thousand, one hundred fifty-three".