21660354666453 has 8 divisors (see below), whose sum is σ = 28903412109600. Its totient is φ = 14428766833808.

The previous prime is 21660354666373. The next prime is 21660354666479. The reversal of 21660354666453 is 35466645306612.

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 21660354666453 - 2¹⁶ = 21660354600917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21660354666393 and 21660354666402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660354666253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2867398218 + ... + 2867405771.

It is an arithmetic number, because the mean of its divisors is an integer number (3612926513700).

Almost surely, 2^{21660354666453} is an apocalyptic number.

It is an amenable number.

21660354666453 is a deficient number, since it is larger than the sum of its proper divisors (7243057443147).

21660354666453 is a wasteful number, since it uses less digits than its factorization.

21660354666453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5734805251.

The product of its (nonzero) digits is 55987200, while the sum is 57.

The spelling of 21660354666453 in words is "twenty-one trillion, six hundred sixty billion, three hundred fifty-four million, six hundred sixty-six thousand, four hundred fifty-three".