20661366170 has 8 divisors (see below), whose sum is σ = 37190459124. Its totient is φ = 8264546464.

The previous prime is 20661366157. The next prime is 20661366179. The reversal of 20661366170 is 7166316602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17080660249 + 3580705921 = 130693^2 + 59839^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20661366179) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1033068299 + ... + 1033068318.

Almost surely, 2^20661366170 is an apocalyptic number.

20661366170 is a deficient number, since it is larger than the sum of its proper divisors (16529092954).

20661366170 is a wasteful number, since it uses less digits than its factorization.

20661366170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066136624.

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 20661366170 in words is "twenty billion, six hundred sixty-one million, three hundred sixty-six thousand, one hundred seventy".