21661032116654 has 8 divisors (see below), whose sum is σ = 37133197914288. Its totient is φ = 9283299478560.

The previous prime is 21661032116599. The next prime is 21661032116671. The reversal of 21661032116654 is 45661123016612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773608289867 + ... + 773608289894.

It is an arithmetic number, because the mean of its divisors is an integer number (4641649739286).

Almost surely, 2^{21661032116654} is an apocalyptic number.

21661032116654 is a deficient number, since it is larger than the sum of its proper divisors (15472165797634).

21661032116654 is a wasteful number, since it uses less digits than its factorization.

21661032116654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547216579770.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 21661032116654 in words is "twenty-one trillion, six hundred sixty-one billion, thirty-two million, one hundred sixteen thousand, six hundred fifty-four".