161406138973 has 4 divisors (see below), whose sum is σ = 161409030048. Its totient is φ = 161403247900.

The previous prime is 161406138967. The next prime is 161406139067. The reversal of 161406138973 is 379831604161.

161406138973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 161406138973 - 2²⁹ = 160869268061 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161406138953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1360111 + ... + 1474012.

It is an arithmetic number, because the mean of its divisors is an integer number (40352257512).

Almost surely, 2^161406138973 is an apocalyptic number.

It is an amenable number.

161406138973 is a deficient number, since it is larger than the sum of its proper divisors (2891075).

161406138973 is an equidigital number, since it uses as much as digits as its factorization.

161406138973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891074.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 161406138973 in words is "one hundred sixty-one billion, four hundred six million, one hundred thirty-eight thousand, nine hundred seventy-three".