161293232251 has 8 divisors (see below), whose sum is σ = 163089511424. Its totient is φ = 159506533800.

The previous prime is 161293232237. The next prime is 161293232257. The reversal of 161293232251 is 152232392161.

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

It is a cyclic number.

It is not a de Polignac number, because 161293232251 - 2²¹ = 161291135099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161293232251.

It is not an unprimeable number, because it can be changed into a prime (161293232257) 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, 2361321 + ... + 2428666.

It is an arithmetic number, because the mean of its divisors is an integer number (20386188928).

Almost surely, 2^161293232251 is an apocalyptic number.

161293232251 is a deficient number, since it is larger than the sum of its proper divisors (1796279173).

161293232251 is a wasteful number, since it uses less digits than its factorization.

161293232251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790361.

The product of its digits is 38880, while the sum is 37.

The spelling of 161293232251 in words is "one hundred sixty-one billion, two hundred ninety-three million, two hundred thirty-two thousand, two hundred fifty-one".