20661366064 has 40 divisors (see below), whose sum is σ = 40159608192. Its totient is φ = 10297658880.

The previous prime is 20661366031. The next prime is 20661366073. The reversal of 20661366064 is 46066316602.

It is a super-2 number, since 2×20661366064² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8463084 + ... + 8465524.

Almost surely, 2^20661366064 is an apocalyptic number.

It is an amenable number.

20661366064 is a deficient number, since it is larger than the sum of its proper divisors (19498242128).

20661366064 is a wasteful number, since it uses less digits than its factorization.

20661366064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3925 (or 3919 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 40.

The spelling of 20661366064 in words is "twenty billion, six hundred sixty-one million, three hundred sixty-six thousand, sixty-four".