20654515006661 has 8 divisors (see below), whose sum is σ = 21036864837024. Its totient is φ = 20274343808400.

The previous prime is 20654515006583. The next prime is 20654515006691. The reversal of 20654515006661 is 16660051545602.

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 20654515006661 - 2³⁴ = 20637335137477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20654515006691) 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, 544638890 + ... + 544676811.

It is an arithmetic number, because the mean of its divisors is an integer number (2629608104628).

Almost surely, 2^{20654515006661} is an apocalyptic number.

It is an amenable number.

20654515006661 is a deficient number, since it is larger than the sum of its proper divisors (382349830363).

20654515006661 is a wasteful number, since it uses less digits than its factorization.

20654515006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089316051.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 20654515006661 in words is "twenty trillion, six hundred fifty-four billion, five hundred fifteen million, six thousand, six hundred sixty-one".