161751814873 has 4 divisors (see below), whose sum is σ = 176456525328. Its totient is φ = 147047104420.

The previous prime is 161751814853. The next prime is 161751814891. The reversal of 161751814873 is 378418157161.

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 161751814873 - 2⁵ = 161751814841 is a prime.

It is a super-2 number, since 2×161751814873² (a number of 23 digits) contains 22 as substring.

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 161751814873.

It is not an unprimeable number, because it can be changed into a prime (161751814813) 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, 7352355211 + ... + 7352355232.

It is an arithmetic number, because the mean of its divisors is an integer number (44114131332).

Almost surely, 2^161751814873 is an apocalyptic number.

It is an amenable number.

161751814873 is a deficient number, since it is larger than the sum of its proper divisors (14704710455).

161751814873 is a wasteful number, since it uses less digits than its factorization.

161751814873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14704710454.

The product of its digits is 1128960, while the sum is 52.

The spelling of 161751814873 in words is "one hundred sixty-one billion, seven hundred fifty-one million, eight hundred fourteen thousand, eight hundred seventy-three".