161143351551 has 96 divisors (see below), whose sum is σ = 301752622080. Its totient is φ = 80472268800.

The previous prime is 161143351547. The next prime is 161143351591. The reversal of 161143351551 is 155153341161.

161143351551 is a `hidden beast` number, since 1 + 6 + 11 + 43 + 3 + 51 + 551 = 666.

It is not a de Polignac number, because 161143351551 - 2² = 161143351547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161143351531) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 35959231 + ... + 35963711.

It is an arithmetic number, because the mean of its divisors is an integer number (3143256480).

Almost surely, 2^161143351551 is an apocalyptic number.

161143351551 is a deficient number, since it is larger than the sum of its proper divisors (140609270529).

161143351551 is a wasteful number, since it uses less digits than its factorization.

161143351551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837 (or 6834 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 161143351551 in words is "one hundred sixty-one billion, one hundred forty-three million, three hundred fifty-one thousand, five hundred fifty-one".