161131203557 has 8 divisors (see below), whose sum is σ = 161759656800. Its totient is φ = 160503703920.

The previous prime is 161131203487. The next prime is 161131203587. The reversal of 161131203557 is 755302131161.

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 161131203557 - 2³² = 156836236261 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 (161131203587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101138 + ... + 576620.

It is an arithmetic number, because the mean of its divisors is an integer number (20219957100).

Almost surely, 2^161131203557 is an apocalyptic number.

It is an amenable number.

161131203557 is a deficient number, since it is larger than the sum of its proper divisors (628453243).

161131203557 is an equidigital number, since it uses as much as digits as its factorization.

161131203557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476803.

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 161131203557 in words is "one hundred sixty-one billion, one hundred thirty-one million, two hundred three thousand, five hundred fifty-seven".