206415330551 has 4 divisors (see below), whose sum is σ = 213533100600. Its totient is φ = 199297560504.

The previous prime is 206415330487. The next prime is 206415330557. The reversal of 206415330551 is 155033514602.

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 206415330551 - 2⁶ = 206415330487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206415330557) 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, 3558884981 + ... + 3558885038.

It is an arithmetic number, because the mean of its divisors is an integer number (53383275150).

Almost surely, 2^206415330551 is an apocalyptic number.

206415330551 is a deficient number, since it is larger than the sum of its proper divisors (7117770049).

206415330551 is an equidigital number, since it uses as much as digits as its factorization.

206415330551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7117770048.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 206415330551 in words is "two hundred six billion, four hundred fifteen million, three hundred thirty thousand, five hundred fifty-one".