161131556053 has 4 divisors (see below), whose sum is σ = 173526291148. Its totient is φ = 148736820960.

The previous prime is 161131555993. The next prime is 161131556063. The reversal of 161131556053 is 350655131161.

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 30967904529 + 130163651524 = 175977^2 + 360782^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161131556053 is a prime.

It is a super-2 number, since 2×161131556053² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161131556063) 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, 6197367528 + ... + 6197367553.

It is an arithmetic number, because the mean of its divisors is an integer number (43381572787).

Almost surely, 2^161131556053 is an apocalyptic number.

161131556053 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161131556053 is a deficient number, since it is larger than the sum of its proper divisors (12394735095).

161131556053 is a wasteful number, since it uses less digits than its factorization.

161131556053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12394735094.

The product of its (nonzero) digits is 40500, while the sum is 37.

The spelling of 161131556053 in words is "one hundred sixty-one billion, one hundred thirty-one million, five hundred fifty-six thousand, fifty-three".