164443351261561 has 16 divisors (see below), whose sum is σ = 168315848230464. Its totient is φ = 160573053763584.

The previous prime is 164443351261507. The next prime is 164443351261627. The reversal of 164443351261561 is 165162153344461.

It is a cyclic number.

It is not a de Polignac number, because 164443351261561 - 2¹¹ = 164443351259513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164443351261499 and 164443351261508.

It is not an unprimeable number, because it can be changed into a prime (164443351291561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2383444281 + ... + 2383513273.

It is an arithmetic number, because the mean of its divisors is an integer number (10519740514404).

Almost surely, 2^{164443351261561} is an apocalyptic number.

It is an amenable number.

164443351261561 is a deficient number, since it is larger than the sum of its proper divisors (3872496968903).

164443351261561 is an equidigital number, since it uses as much as digits as its factorization.

164443351261561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84120.

The product of its digits is 6220800, while the sum is 52.

The spelling of 164443351261561 in words is "one hundred sixty-four trillion, four hundred forty-three billion, three hundred fifty-one million, two hundred sixty-one thousand, five hundred sixty-one".