206151655601 has 12 divisors (see below), whose sum is σ = 213394659612. Its totient is φ = 199132080000.

The previous prime is 206151655583. The next prime is 206151655639. The reversal of 206151655601 is 106556151602.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 42179301376 + 163972354225 = 205376^2 + 404935^2 .

It is not a de Polignac number, because 206151655601 - 2²⁶ = 206084546737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206151655651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437330 + ... + 776891.

It is an arithmetic number, because the mean of its divisors is an integer number (17782888301).

Almost surely, 2^206151655601 is an apocalyptic number.

It is an amenable number.

206151655601 is a deficient number, since it is larger than the sum of its proper divisors (7243004011).

206151655601 is a wasteful number, since it uses less digits than its factorization.

206151655601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214404 (or 1214363 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 206151655601 in words is "two hundred six billion, one hundred fifty-one million, six hundred fifty-five thousand, six hundred one".