161351495773 has 4 divisors (see below), whose sum is σ = 173763149308. Its totient is φ = 148939842240.

The previous prime is 161351495743. The next prime is 161351495777. The reversal of 161351495773 is 377594153161.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28241810809 + 133109684964 = 168053^2 + 364842^2 .

It is a cyclic number.

It is not a de Polignac number, because 161351495773 - 2⁵ = 161351495741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161351495773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161351495777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6205826748 + ... + 6205826773.

It is an arithmetic number, because the mean of its divisors is an integer number (43440787327).

Almost surely, 2^161351495773 is an apocalyptic number.

161351495773 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161351495773 is a deficient number, since it is larger than the sum of its proper divisors (12411653535).

161351495773 is a wasteful number, since it uses less digits than its factorization.

161351495773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12411653534.

The product of its digits is 2381400, while the sum is 52.

The spelling of 161351495773 in words is "one hundred sixty-one billion, three hundred fifty-one million, four hundred ninety-five thousand, seven hundred seventy-three".