161370424661 has 4 divisors (see below), whose sum is σ = 161376508524. Its totient is φ = 161364340800.

The previous prime is 161370424651. The next prime is 161370424669. The reversal of 161370424661 is 166424073161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166424073161 = 6007 ⋅27705023.

It can be written as a sum of positive squares in 2 ways, for example, as 36977367025 + 124393057636 = 192295^2 + 352694^2 .

It is a cyclic number.

It is not a de Polignac number, because 161370424661 - 2³⁰ = 160296682837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161370424669) 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, 3001970 + ... + 3055251.

It is an arithmetic number, because the mean of its divisors is an integer number (40344127131).

Almost surely, 2^161370424661 is an apocalyptic number.

It is an amenable number.

161370424661 is a deficient number, since it is larger than the sum of its proper divisors (6083863).

161370424661 is an equidigital number, since it uses as much as digits as its factorization.

161370424661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083862.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 161370424661 in words is "one hundred sixty-one billion, three hundred seventy million, four hundred twenty-four thousand, six hundred sixty-one".