216161240400561 has 8 divisors (see below), whose sum is σ = 288223156932480. Its totient is φ = 144103408734512.

The previous prime is 216161240400551. The next prime is 216161240400563. The reversal of 216161240400561 is 165004042161612.

216161240400561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216161240400561 - 2¹¹ = 216161240398513 is a prime.

It is a super-2 number, since 2×216161240400561² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216161240400563) 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, 1021092990 + ... + 1021304663.

It is an arithmetic number, because the mean of its divisors is an integer number (36027894616560).

Almost surely, 2^{216161240400561} is an apocalyptic number.

It is an amenable number.

216161240400561 is a deficient number, since it is larger than the sum of its proper divisors (72061916531919).

216161240400561 is a wasteful number, since it uses less digits than its factorization.

216161240400561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042432935.

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 216161240400561 in words is "two hundred sixteen trillion, one hundred sixty-one billion, two hundred forty million, four hundred thousand, five hundred sixty-one".