167431320561 has 4 divisors (see below), whose sum is σ = 223241760752. Its totient is φ = 111620880372.

The previous prime is 167431320557. The next prime is 167431320569. The reversal of 167431320561 is 165023134761.

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: 165023134761 = 3 ⋅55007711587.

It is not a de Polignac number, because 167431320561 - 2² = 167431320557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167431320569) 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, 27905220091 + ... + 27905220096.

It is an arithmetic number, because the mean of its divisors is an integer number (55810440188).

Almost surely, 2^167431320561 is an apocalyptic number.

It is an amenable number.

167431320561 is a deficient number, since it is larger than the sum of its proper divisors (55810440191).

167431320561 is an equidigital number, since it uses as much as digits as its factorization.

167431320561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55810440190.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 167431320561 in words is "one hundred sixty-seven billion, four hundred thirty-one million, three hundred twenty thousand, five hundred sixty-one".