161620500406373 has 2 divisors, whose sum is σ = 161620500406374. Its totient is φ = 161620500406372.

The previous prime is 161620500406271. The next prime is 161620500406433. The reversal of 161620500406373 is 373604005026161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123311741394724 + 38308759011649 = 11104582^2 + 6189407^2 .

It is a cyclic number.

It is not a de Polignac number, because 161620500406373 - 2³² = 161616205439077 is a prime.

It is a super-2 number, since 2×161620500406373² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161620500406073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80810250203186 + 80810250203187.

It is an arithmetic number, because the mean of its divisors is an integer number (80810250203187).

Almost surely, 2^{161620500406373} is an apocalyptic number.

It is an amenable number.

161620500406373 is a deficient number, since it is larger than the sum of its proper divisors (1).

161620500406373 is an equidigital number, since it uses as much as digits as its factorization.

161620500406373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 161620500406373 in words is "one hundred sixty-one trillion, six hundred twenty billion, five hundred million, four hundred six thousand, three hundred seventy-three".