161525423713 has 4 divisors (see below), whose sum is σ = 167095265940. Its totient is φ = 155955581488.

The previous prime is 161525423623. The next prime is 161525423747. The reversal of 161525423713 is 317324525161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 317324525161 = 7 ⋅45332075023.

It can be written as a sum of positive squares in 2 ways, for example, as 132792461649 + 28732962064 = 364407^2 + 169508^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161525423713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161525463713) 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, 2784921070 + ... + 2784921127.

It is an arithmetic number, because the mean of its divisors is an integer number (41773816485).

Almost surely, 2^161525423713 is an apocalyptic number.

It is an amenable number.

161525423713 is a deficient number, since it is larger than the sum of its proper divisors (5569842227).

161525423713 is an equidigital number, since it uses as much as digits as its factorization.

161525423713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569842226.

The product of its digits is 151200, while the sum is 40.

Adding to 161525423713 its reverse (317324525161), we get a palindrome (478849948874).

The spelling of 161525423713 in words is "one hundred sixty-one billion, five hundred twenty-five million, four hundred twenty-three thousand, seven hundred thirteen".