21655044166445 has 8 divisors (see below), whose sum is σ = 27353739999840. Its totient is φ = 16412243999760.

The previous prime is 21655044166433. The next prime is 21655044166447. The reversal of 21655044166445 is 54466144055612.

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

It is not a de Polignac number, because 21655044166445 - 2¹⁰ = 21655044165421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655044166447) 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, 113973916571 + ... + 113973916760.

It is an arithmetic number, because the mean of its divisors is an integer number (3419217499980).

Almost surely, 2^{21655044166445} is an apocalyptic number.

It is an amenable number.

21655044166445 is a deficient number, since it is larger than the sum of its proper divisors (5698695833395).

21655044166445 is a wasteful number, since it uses less digits than its factorization.

21655044166445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227947833355.

The product of its (nonzero) digits is 13824000, while the sum is 53.

The spelling of 21655044166445 in words is "twenty-one trillion, six hundred fifty-five billion, forty-four million, one hundred sixty-six thousand, four hundred forty-five".