161620645111323 has 4 divisors (see below), whose sum is σ = 215494193481768. Its totient is φ = 107747096740880.

The previous prime is 161620645111273. The next prime is 161620645111333. The reversal of 161620645111323 is 323111546026161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161620645111323 - 2¹⁶ = 161620645045787 is a prime.

It is a super-2 number, since 2×161620645111323² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161620645111333) 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, 26936774185218 + ... + 26936774185223.

It is an arithmetic number, because the mean of its divisors is an integer number (53873548370442).

Almost surely, 2^{161620645111323} is an apocalyptic number.

161620645111323 is a deficient number, since it is larger than the sum of its proper divisors (53873548370445).

161620645111323 is an equidigital number, since it uses as much as digits as its factorization.

161620645111323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53873548370444.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 161620645111323 in words is "one hundred sixty-one trillion, six hundred twenty billion, six hundred forty-five million, one hundred eleven thousand, three hundred twenty-three".