21464605666 has 16 divisors (see below), whose sum is σ = 36806688000. Its totient is φ = 9196561440.

The previous prime is 21464605571. The next prime is 21464605709. The reversal of 21464605666 is 66650646412.

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, 160291 + ... + 261958.

It is an arithmetic number, because the mean of its divisors is an integer number (2300418000).

Almost surely, 2^21464605666 is an apocalyptic number.

21464605666 is a deficient number, since it is larger than the sum of its proper divisors (15342082334).

21464605666 is a wasteful number, since it uses less digits than its factorization.

21464605666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425889.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 21464605666 in words is "twenty-one billion, four hundred sixty-four million, six hundred five thousand, six hundred sixty-six".