21766988666570 has 64 divisors (see below), whose sum is σ = 47153333399040. Its totient is φ = 7072999895808.

The previous prime is 21766988666509. The next prime is 21766988666681. The reversal of 21766988666570 is 7566688966712.

It is a super-2 number, since 2×21766988666570² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21766988666491 and 21766988666500.

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 31 ways as a sum of consecutive naturals, for example, 61842257 + ... + 62193236.

It is an arithmetic number, because the mean of its divisors is an integer number (736770834360).

Almost surely, 2^{21766988666570} is an apocalyptic number.

21766988666570 is an abundant number, since it is smaller than the sum of its proper divisors (25386344732470).

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

21766988666570 is a wasteful number, since it uses less digits than its factorization.

21766988666570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124035639.

The product of its (nonzero) digits is 2194698240, while the sum is 77.

The spelling of 21766988666570 in words is "twenty-one trillion, seven hundred sixty-six billion, nine hundred eighty-eight million, six hundred sixty-six thousand, five hundred seventy".