21554610630664 has 256 divisors, whose sum is σ = 46562526259200. Its totient is φ = 9299946700800.

The previous prime is 21554610630617. The next prime is 21554610630697. The reversal of 21554610630664 is 46603601645512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3639134407 + ... + 3639140329.

It is an arithmetic number, because the mean of its divisors is an integer number (181884868200).

Almost surely, 2^{21554610630664} is an apocalyptic number.

It is an amenable number.

21554610630664 is an abundant number, since it is smaller than the sum of its proper divisors (25007915628536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21554610630664 is a wasteful number, since it uses less digits than its factorization.

21554610630664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6624 (or 6620 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 21554610630664 in words is "twenty-one trillion, five hundred fifty-four billion, six hundred ten million, six hundred thirty thousand, six hundred sixty-four".