161965405135 has 8 divisors (see below), whose sum is σ = 199098937296. Its totient is φ = 126412023360.

The previous prime is 161965405111. The next prime is 161965405153. The reversal of 161965405135 is 531504569161.

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

It is not a de Polignac number, because 161965405135 - 2²³ = 161957016527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395037369 + ... + 395037778.

It is an arithmetic number, because the mean of its divisors is an integer number (24887367162).

Almost surely, 2^161965405135 is an apocalyptic number.

161965405135 is a deficient number, since it is larger than the sum of its proper divisors (37133532161).

161965405135 is an equidigital number, since it uses as much as digits as its factorization.

161965405135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790075193.

The product of its (nonzero) digits is 486000, while the sum is 46.

The spelling of 161965405135 in words is "one hundred sixty-one billion, nine hundred sixty-five million, four hundred five thousand, one hundred thirty-five".