161587876129 has 4 divisors (see below), whose sum is σ = 161629883584. Its totient is φ = 161545868676.

The previous prime is 161587876091. The next prime is 161587876133. The reversal of 161587876129 is 921678785161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 921678785161 = 21067 ⋅43749883.

It is a cyclic number.

It is not a de Polignac number, because 161587876129 - 2⁷ = 161587876001 is a prime.

It is a super-2 number, since 2×161587876129² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161587846129) 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, 20997957 + ... + 21005650.

It is an arithmetic number, because the mean of its divisors is an integer number (40407470896).

Almost surely, 2^161587876129 is an apocalyptic number.

It is an amenable number.

161587876129 is a deficient number, since it is larger than the sum of its proper divisors (42007455).

161587876129 is an equidigital number, since it uses as much as digits as its factorization.

161587876129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42007454.

The product of its digits is 10160640, while the sum is 61.

The spelling of 161587876129 in words is "one hundred sixty-one billion, five hundred eighty-seven million, eight hundred seventy-six thousand, one hundred twenty-nine".