20851625166 has 8 divisors (see below), whose sum is σ = 41703250344. Its totient is φ = 6950541720.

The previous prime is 20851625159. The next prime is 20851625167. The reversal of 20851625166 is 66152615802.

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

20851625166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20851625167) 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, 1737635425 + ... + 1737635436.

It is an arithmetic number, because the mean of its divisors is an integer number (5212906293).

Almost surely, 2^20851625166 is an apocalyptic number.

20851625166 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.

20851625166 is a wasteful number, since it uses less digits than its factorization.

20851625166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475270866.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 20851625166 in words is "twenty billion, eight hundred fifty-one million, six hundred twenty-five thousand, one hundred sixty-six".