644642646611154 has 8 divisors (see below), whose sum is σ = 1289285293222320. Its totient is φ = 214880882203716.

The previous prime is 644642646611137. The next prime is 644642646611177. The reversal of 644642646611154 is 451116646246446.

644642646611154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

644642646611154 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53720220550924 + ... + 53720220550935.

It is an arithmetic number, because the mean of its divisors is an integer number (161160661652790).

Almost surely, 2^{644642646611154} is an apocalyptic number.

644642646611154 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644642646611154 is a wasteful number, since it uses less digits than its factorization.

644642646611154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107440441101864.

The product of its digits is 79626240, while the sum is 60.

The spelling of 644642646611154 in words is "six hundred forty-four trillion, six hundred forty-two billion, six hundred forty-six million, six hundred eleven thousand, one hundred fifty-four".