444673321556551 has 4 divisors (see below), whose sum is σ = 444676348071432. Its totient is φ = 444670295041672.

The previous prime is 444673321556543. The next prime is 444673321556561. The reversal of 444673321556551 is 155655123376444.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 444673321556551 - 2³ = 444673321556543 is a prime.

It is a super-2 number, since 2×444673321556551² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 444673321556551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444673321556531) 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, 1513037041 + ... + 1513330906.

It is an arithmetic number, because the mean of its divisors is an integer number (111169087017858).

Almost surely, 2^{444673321556551} is an apocalyptic number.

444673321556551 is a deficient number, since it is larger than the sum of its proper divisors (3026514881).

444673321556551 is a wasteful number, since it uses less digits than its factorization.

444673321556551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026514880.

The product of its digits is 181440000, while the sum is 61.

The spelling of 444673321556551 in words is "four hundred forty-four trillion, six hundred seventy-three billion, three hundred twenty-one million, five hundred fifty-six thousand, five hundred fifty-one".