161261355235 has 8 divisors (see below), whose sum is σ = 193829312880. Its totient is φ = 128798626464.

The previous prime is 161261355217. The next prime is 161261355239. The reversal of 161261355235 is 532553162161.

It is a happy number.

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 161261355235 - 2¹³ = 161261347043 is a prime.

It is a super-3 number, since 3×161261355235³ (a number of 35 digits) contains 333 as substring.

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, 26303845 + ... + 26309974.

It is an arithmetic number, because the mean of its divisors is an integer number (24228664110).

Almost surely, 2^161261355235 is an apocalyptic number.

161261355235 is a deficient number, since it is larger than the sum of its proper divisors (32567957645).

161261355235 is an equidigital number, since it uses as much as digits as its factorization.

161261355235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52614437.

The product of its digits is 162000, while the sum is 40.

The spelling of 161261355235 in words is "one hundred sixty-one billion, two hundred sixty-one million, three hundred fifty-five thousand, two hundred thirty-five".