161333401213 has 4 divisors (see below), whose sum is σ = 161390151648. Its totient is φ = 161276650780.

The previous prime is 161333401133. The next prime is 161333401231. The reversal of 161333401213 is 312104333161.

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: 312104333161 = 4153 ⋅75151537.

It is a cyclic number.

It is not a de Polignac number, because 161333401213 - 2³⁷ = 23894447741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161333401253) 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, 28370953 + ... + 28376638.

It is an arithmetic number, because the mean of its divisors is an integer number (40347537912).

Almost surely, 2^161333401213 is an apocalyptic number.

It is an amenable number.

161333401213 is a deficient number, since it is larger than the sum of its proper divisors (56750435).

161333401213 is an equidigital number, since it uses as much as digits as its factorization.

161333401213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56750434.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 161333401213 its reverse (312104333161), we get a palindrome (473437734374).

The spelling of 161333401213 in words is "one hundred sixty-one billion, three hundred thirty-three million, four hundred one thousand, two hundred thirteen".