161261355237 has 8 divisors (see below), whose sum is σ = 215244615936. Its totient is φ = 107392832352.

The previous prime is 161261355217. The next prime is 161261355239. The reversal of 161261355237 is 732553162161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161261355237 - 2¹⁰ = 161261354213 is a prime.

It is a super-3 number, since 3×161261355237³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161261355239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28681173 + ... + 28686794.

It is an arithmetic number, because the mean of its divisors is an integer number (26905576992).

Almost surely, 2^161261355237 is an apocalyptic number.

It is an amenable number.

161261355237 is a deficient number, since it is larger than the sum of its proper divisors (53983260699).

161261355237 is an equidigital number, since it uses as much as digits as its factorization.

161261355237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57368907.

The product of its digits is 226800, while the sum is 42.

The spelling of 161261355237 in words is "one hundred sixty-one billion, two hundred sixty-one million, three hundred fifty-five thousand, two hundred thirty-seven".