20666111658 has 8 divisors (see below), whose sum is σ = 41332223328. Its totient is φ = 6888703884.

The previous prime is 20666111657. The next prime is 20666111671. The reversal of 20666111658 is 85611166602.

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

20666111658 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20666111657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1722175966 + ... + 1722175977.

It is an arithmetic number, because the mean of its divisors is an integer number (5166527916).

Almost surely, 2^20666111658 is an apocalyptic number.

20666111658 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20666111658 is a wasteful number, since it uses less digits than its factorization.

20666111658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444351948.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 20666111658 in words is "twenty billion, six hundred sixty-six million, one hundred eleven thousand, six hundred fifty-eight".