161043266251 has 8 divisors (see below), whose sum is σ = 184173565184. Its totient is φ = 137943996840.

The previous prime is 161043266221. The next prime is 161043266281. The reversal of 161043266251 is 152662340161.

It is an interprime number because it is at equal distance from previous prime (161043266221) and next prime (161043266281).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161043266251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161043266251.

It is not an unprimeable number, because it can be changed into a prime (161043266221) 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, 7746255 + ... + 7767016.

It is an arithmetic number, because the mean of its divisors is an integer number (23021695648).

Almost surely, 2^161043266251 is an apocalyptic number.

161043266251 is a deficient number, since it is larger than the sum of its proper divisors (23130298933).

161043266251 is a wasteful number, since it uses less digits than its factorization.

161043266251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15514761.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 161043266251 in words is "one hundred sixty-one billion, forty-three million, two hundred sixty-six thousand, two hundred fifty-one".