644402414134445 has 16 divisors (see below), whose sum is σ = 824072060413440. Its totient is φ = 482616276113664.

The previous prime is 644402414134411. The next prime is 644402414134487. The reversal of 644402414134445 is 544431414204446.

It is not a de Polignac number, because 644402414134445 - 2¹⁶ = 644402414068909 is a prime.

It is a super-2 number, since 2×644402414134445² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644402414134393 and 644402414134402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59611688780 + ... + 59611699589.

It is an arithmetic number, because the mean of its divisors is an integer number (51504503775840).

Almost surely, 2^{644402414134445} is an apocalyptic number.

It is an amenable number.

644402414134445 is a deficient number, since it is larger than the sum of its proper divisors (179669646278995).

644402414134445 is a wasteful number, since it uses less digits than its factorization.

644402414134445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119223388444.

The product of its (nonzero) digits is 11796480, while the sum is 50.

The spelling of 644402414134445 in words is "six hundred forty-four trillion, four hundred two billion, four hundred fourteen million, one hundred thirty-four thousand, four hundred forty-five".