161115135971 has 8 divisors (see below), whose sum is σ = 162190427280. Its totient is φ = 160040904192.

The previous prime is 161115135941. The next prime is 161115135991. The reversal of 161115135971 is 179531511161.

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 161115135971 - 2¹⁸ = 161114873827 is a prime.

It is a super-2 number, since 2×161115135971² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161115135941) 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, 41435 + ... + 569163.

It is an arithmetic number, because the mean of its divisors is an integer number (20273803410).

Almost surely, 2^161115135971 is an apocalyptic number.

161115135971 is a deficient number, since it is larger than the sum of its proper divisors (1075291309).

161115135971 is a wasteful number, since it uses less digits than its factorization.

161115135971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529765.

The product of its digits is 28350, while the sum is 41.

The spelling of 161115135971 in words is "one hundred sixty-one billion, one hundred fifteen million, one hundred thirty-five thousand, nine hundred seventy-one".