206415000251 has 4 divisors (see below), whose sum is σ = 206492983632. Its totient is φ = 206337016872.

The previous prime is 206415000167. The next prime is 206415000283. The reversal of 206415000251 is 152000514602.

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 206415000251 - 2³⁴ = 189235131067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206415000251.

It is not an unprimeable number, because it can be changed into a prime (206415000551) 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, 38987720 + ... + 38993013.

It is an arithmetic number, because the mean of its divisors is an integer number (51623245908).

Almost surely, 2^206415000251 is an apocalyptic number.

206415000251 is a deficient number, since it is larger than the sum of its proper divisors (77983381).

206415000251 is an equidigital number, since it uses as much as digits as its factorization.

206415000251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77983380.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 206415000251 its reverse (152000514602), we get a palindrome (358415514853).

The spelling of 206415000251 in words is "two hundred six billion, four hundred fifteen million, two hundred fifty-one", and thus it is an aban number.