161215422307361 has 4 divisors (see below), whose sum is σ = 162392177214852. Its totient is φ = 160038667399872.

The previous prime is 161215422307337. The next prime is 161215422307441. The reversal of 161215422307361 is 163703224512161.

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 43405433358400 + 117809988948961 = 6588280^2 + 10854031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161215422307361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161215422397361) 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, 588377453540 + ... + 588377453813.

It is an arithmetic number, because the mean of its divisors is an integer number (40598044303713).

Almost surely, 2^{161215422307361} is an apocalyptic number.

It is an amenable number.

161215422307361 is a deficient number, since it is larger than the sum of its proper divisors (1176754907491).

161215422307361 is a wasteful number, since it uses less digits than its factorization.

161215422307361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176754907490.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 161215422307361 in words is "one hundred sixty-one trillion, two hundred fifteen billion, four hundred twenty-two million, three hundred seven thousand, three hundred sixty-one".