161342189057 has 4 divisors (see below), whose sum is σ = 184391073216. Its totient is φ = 138293304900.

The previous prime is 161342189027. The next prime is 161342189077. The reversal of 161342189057 is 750981243161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 750981243161 = 41609 ⋅18048529.

It is a cyclic number.

It is not a de Polignac number, because 161342189057 - 2²⁶ = 161275080193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161342189027) 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 in 3 ways as a sum of consecutive naturals, for example, 11524442069 + ... + 11524442082.

It is an arithmetic number, because the mean of its divisors is an integer number (46097768304).

It is a 1-persistent number, because it is pandigital, but 2⋅161342189057 = 322684378114 is not.

Almost surely, 2^161342189057 is an apocalyptic number.

It is an amenable number.

161342189057 is a deficient number, since it is larger than the sum of its proper divisors (23048884159).

161342189057 is an equidigital number, since it uses as much as digits as its factorization.

161342189057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23048884158.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 161342189057 in words is "one hundred sixty-one billion, three hundred forty-two million, one hundred eighty-nine thousand, fifty-seven".