161867661720351 has 8 divisors (see below), whose sum is σ = 215827676525184. Its totient is φ = 107909710697880.

The previous prime is 161867661720307. The next prime is 161867661720379. The reversal of 161867661720351 is 153027166768161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161867661720351 - 2⁶ = 161867661720287 is a prime.

It is a super-2 number, since 2×161867661720351² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161867661720851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515762571 + ... + 516076316.

It is an arithmetic number, because the mean of its divisors is an integer number (26978459565648).

Almost surely, 2^{161867661720351} is an apocalyptic number.

161867661720351 is a deficient number, since it is larger than the sum of its proper divisors (53960014804833).

161867661720351 is a wasteful number, since it uses less digits than its factorization.

161867661720351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031891181.

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 161867661720351 in words is "one hundred sixty-one trillion, eight hundred sixty-seven billion, six hundred sixty-one million, seven hundred twenty thousand, three hundred fifty-one".