20416001451661 has 8 divisors (see below), whose sum is σ = 20425214699640. Its totient is φ = 20406790290432.

The previous prime is 20416001451589. The next prime is 20416001451673. The reversal of 20416001451661 is 16615410061402.

It can be written as a sum of positive squares in 4 ways, for example, as 912342025 + 20415089109636 = 30205^2 + 4518306^2 .

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 20416001451661 - 2³⁹ = 19866245637773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20416001451661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20416001451961) 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, 19218105 + ... + 20252593.

It is an arithmetic number, because the mean of its divisors is an integer number (2553151837455).

Almost surely, 2^{20416001451661} is an apocalyptic number.

It is an amenable number.

20416001451661 is a deficient number, since it is larger than the sum of its proper divisors (9213247979).

20416001451661 is a wasteful number, since it uses less digits than its factorization.

20416001451661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043375.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 20416001451661 in words is "twenty trillion, four hundred sixteen billion, one million, four hundred fifty-one thousand, six hundred sixty-one".