8161473772031 has 2 divisors, whose sum is σ = 8161473772032. Its totient is φ = 8161473772030.

The previous prime is 8161473772009. The next prime is 8161473772051. The reversal of 8161473772031 is 1302773741618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8161473772031 - 2⁶ = 8161473771967 is a prime.

It is a super-2 number, since 2×8161473772031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8161473772051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080736886015 + 4080736886016.

It is an arithmetic number, because the mean of its divisors is an integer number (4080736886016).

Almost surely, 2^{8161473772031} is an apocalyptic number.

8161473772031 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161473772031 is an equidigital number, since it uses as much as digits as its factorization.

8161473772031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 8161473772031 in words is "eight trillion, one hundred sixty-one billion, four hundred seventy-three million, seven hundred seventy-two thousand, thirty-one".