20016600251 has 4 divisors (see below), whose sum is σ = 20150940000. Its totient is φ = 19882260504.

The previous prime is 20016600229. The next prime is 20016600277. The reversal of 20016600251 is 15200661002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20016600251 - 2¹⁰ = 20016599227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20016600221) 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, 67169651 + ... + 67169948.

It is an arithmetic number, because the mean of its divisors is an integer number (5037735000).

Almost surely, 2^20016600251 is an apocalyptic number.

20016600251 is a deficient number, since it is larger than the sum of its proper divisors (134339749).

20016600251 is a wasteful number, since it uses less digits than its factorization.

20016600251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134339748.

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 20016600251 in words is "twenty billion, sixteen million, six hundred thousand, two hundred fifty-one".