644956032297 has 8 divisors (see below), whose sum is σ = 859945604544. Its totient is φ = 429968574128.

The previous prime is 644956032277. The next prime is 644956032319. The reversal of 644956032297 is 792230659446.

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

It is a cyclic number.

It is not a de Polignac number, because 644956032297 - 2¹⁹ = 644955508009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644956032257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433468 + ... + 1215650.

It is an arithmetic number, because the mean of its divisors is an integer number (107493200568).

Almost surely, 2^644956032297 is an apocalyptic number.

It is an amenable number.

644956032297 is a deficient number, since it is larger than the sum of its proper divisors (214989572247).

644956032297 is a wasteful number, since it uses less digits than its factorization.

644956032297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057039.

The product of its (nonzero) digits is 19595520, while the sum is 57.

The spelling of 644956032297 in words is "six hundred forty-four billion, nine hundred fifty-six million, thirty-two thousand, two hundred ninety-seven".