161507711527 has 4 divisors (see below), whose sum is σ = 161512670880. Its totient is φ = 161502752176.

The previous prime is 161507711509. The next prime is 161507711531. The reversal of 161507711527 is 725117705161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 725117705161 = 331 ⋅2190687931.

It is a cyclic number.

It is not a de Polignac number, because 161507711527 - 2¹¹ = 161507709479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161507711507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2430502 + ... + 2496067.

It is an arithmetic number, because the mean of its divisors is an integer number (40378167720).

Almost surely, 2^161507711527 is an apocalyptic number.

161507711527 is a deficient number, since it is larger than the sum of its proper divisors (4959353).

161507711527 is an equidigital number, since it uses as much as digits as its factorization.

161507711527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4959352.

The product of its (nonzero) digits is 102900, while the sum is 43.

The spelling of 161507711527 in words is "one hundred sixty-one billion, five hundred seven million, seven hundred eleven thousand, five hundred twenty-seven".