161099258449 has 4 divisors (see below), whose sum is σ = 161294058864. Its totient is φ = 160904458036.

The previous prime is 161099258429. The next prime is 161099258477. The reversal of 161099258449 is 944852990161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161099258449 - 2⁷ = 161099258321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161099258393 and 161099258402.

It is not an unprimeable number, because it can be changed into a prime (161099258429) 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, 97398967 + ... + 97400620.

It is an arithmetic number, because the mean of its divisors is an integer number (40323514716).

Almost surely, 2^161099258449 is an apocalyptic number.

It is an amenable number.

161099258449 is a deficient number, since it is larger than the sum of its proper divisors (194800415).

161099258449 is an equidigital number, since it uses as much as digits as its factorization.

161099258449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194800414.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 161099258449 in words is "one hundred sixty-one billion, ninety-nine million, two hundred fifty-eight thousand, four hundred forty-nine".