161073531013 has 4 divisors (see below), whose sum is σ = 170548444620. Its totient is φ = 151598617408.

The previous prime is 161073531011. The next prime is 161073531077. The reversal of 161073531013 is 310135370161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102462089409 + 58611441604 = 320097^2 + 242098^2 .

It is a cyclic number.

It is not a de Polignac number, because 161073531013 - 2¹ = 161073531011 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 (161073531011) 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, 4737456778 + ... + 4737456811.

It is an arithmetic number, because the mean of its divisors is an integer number (42637111155).

Almost surely, 2^161073531013 is an apocalyptic number.

It is an amenable number.

161073531013 is a deficient number, since it is larger than the sum of its proper divisors (9474913607).

161073531013 is an equidigital number, since it uses as much as digits as its factorization.

161073531013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9474913606.

The product of its (nonzero) digits is 5670, while the sum is 31.

The spelling of 161073531013 in words is "one hundred sixty-one billion, seventy-three million, five hundred thirty-one thousand, thirteen".