20016173564261 has 8 divisors (see below), whose sum is σ = 22876925126784. Its totient is φ = 17155746550800.

The previous prime is 20016173564237. The next prime is 20016173564269. The reversal of 20016173564261 is 16246537161002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20016173564261 is a prime.

It is a super-2 number, since 2×20016173564261² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20016173564269) 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, 81005090 + ... + 81251811.

It is an arithmetic number, because the mean of its divisors is an integer number (2859615640848).

Almost surely, 2^{20016173564261} is an apocalyptic number.

It is an amenable number.

20016173564261 is a deficient number, since it is larger than the sum of its proper divisors (2860751562523).

20016173564261 is a wasteful number, since it uses less digits than its factorization.

20016173564261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162274531.

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

The spelling of 20016173564261 in words is "twenty trillion, sixteen billion, one hundred seventy-three million, five hundred sixty-four thousand, two hundred sixty-one".