206772057557 has 8 divisors (see below), whose sum is σ = 232359235584. Its totient is φ = 182567970288.

The previous prime is 206772057509. The next prime is 206772057589. The reversal of 206772057557 is 755750277602.

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

It is a cyclic number.

It is not a de Polignac number, because 206772057557 - 2⁶ = 206772057493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206772057499 and 206772057508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206772051557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345772373 + ... + 345772970.

It is an arithmetic number, because the mean of its divisors is an integer number (29044904448).

Almost surely, 2^206772057557 is an apocalyptic number.

It is an amenable number.

206772057557 is a deficient number, since it is larger than the sum of its proper divisors (25587178027).

206772057557 is a wasteful number, since it uses less digits than its factorization.

206772057557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691545379.

The product of its (nonzero) digits is 7203000, while the sum is 53.

The spelling of 206772057557 in words is "two hundred six billion, seven hundred seventy-two million, fifty-seven thousand, five hundred fifty-seven".