644576451347 has 2 divisors, whose sum is σ = 644576451348. Its totient is φ = 644576451346.

The previous prime is 644576451313. The next prime is 644576451359. The reversal of 644576451347 is 743154675446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644576451347 - 2¹⁴ = 644576434963 is a prime.

It is a super-2 number, since 2×644576451347² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644576451292 and 644576451301.

It is not a weakly prime, because it can be changed into another prime (644576451377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322288225673 + 322288225674.

It is an arithmetic number, because the mean of its divisors is an integer number (322288225674).

Almost surely, 2^644576451347 is an apocalyptic number.

644576451347 is a deficient number, since it is larger than the sum of its proper divisors (1).

644576451347 is an equidigital number, since it uses as much as digits as its factorization.

644576451347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33868800, while the sum is 56.

The spelling of 644576451347 in words is "six hundred forty-four billion, five hundred seventy-six million, four hundred fifty-one thousand, three hundred forty-seven".