21660546366154 has 16 divisors (see below), whose sum is σ = 33686659028736. Its totient is φ = 10434738117600.

The previous prime is 21660546366079. The next prime is 21660546366163. The reversal of 21660546366154 is 45166364506612.

It is a junction number, because it is equal to n+sod(n) for n = 21660546366095 and 21660546366104.

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, 769509387 + ... + 769537534.

It is an arithmetic number, because the mean of its divisors is an integer number (2105416189296).

Almost surely, 2^{21660546366154} is an apocalyptic number.

21660546366154 is a deficient number, since it is larger than the sum of its proper divisors (12026112662582).

21660546366154 is a wasteful number, since it uses less digits than its factorization.

21660546366154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539047181.

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 21660546366154 in words is "twenty-one trillion, six hundred sixty billion, five hundred forty-six million, three hundred sixty-six thousand, one hundred fifty-four".