20653556204465 has 8 divisors (see below), whose sum is σ = 24790964108328. Its totient is φ = 16518380521600.

The previous prime is 20653556204429. The next prime is 20653556204497. The reversal of 20653556204465 is 56440265535602.

It can be written as a sum of positive squares in 4 ways, for example, as 872490501184 + 19781065703281 = 934072^2 + 4447591^2 .

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

It is not a de Polignac number, because 20653556204465 - 2¹⁴ = 20653556188081 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558034892 + ... + 558071901.

It is an arithmetic number, because the mean of its divisors is an integer number (3098870513541).

Almost surely, 2^{20653556204465} is an apocalyptic number.

It is an amenable number.

20653556204465 is a deficient number, since it is larger than the sum of its proper divisors (4137407903863).

20653556204465 is a wasteful number, since it uses less digits than its factorization.

20653556204465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116110499.

The product of its (nonzero) digits is 25920000, while the sum is 53.

The spelling of 20653556204465 in words is "twenty trillion, six hundred fifty-three billion, five hundred fifty-six million, two hundred four thousand, four hundred sixty-five".