161104450621 has 2 divisors, whose sum is σ = 161104450622. Its totient is φ = 161104450620.

The previous prime is 161104450553. The next prime is 161104450657. The reversal of 161104450621 is 126054401161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101831192100 + 59273258521 = 319110^2 + 243461^2 .

It is a cyclic number.

It is not a de Polignac number, because 161104450621 - 2²³ = 161096062013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161104450021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80552225310 + 80552225311.

It is an arithmetic number, because the mean of its divisors is an integer number (80552225311).

Almost surely, 2^161104450621 is an apocalyptic number.

It is an amenable number.

161104450621 is a deficient number, since it is larger than the sum of its proper divisors (1).

161104450621 is an equidigital number, since it uses as much as digits as its factorization.

161104450621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 161104450621 its reverse (126054401161), we get a palindrome (287158851782).

The spelling of 161104450621 in words is "one hundred sixty-one billion, one hundred four million, four hundred fifty thousand, six hundred twenty-one".