206661215607 has 64 divisors (see below), whose sum is σ = 353423056896. Its totient is φ = 104307615360.

The previous prime is 206661215591. The next prime is 206661215609. The reversal of 206661215607 is 706512166602.

It is not a de Polignac number, because 206661215607 - 2⁴ = 206661215591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206661215609) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1179088 + ... + 1342970.

It is an arithmetic number, because the mean of its divisors is an integer number (5522235264).

Almost surely, 2^206661215607 is an apocalyptic number.

206661215607 is a deficient number, since it is larger than the sum of its proper divisors (146761841289).

206661215607 is a wasteful number, since it uses less digits than its factorization.

206661215607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164060.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 206661215607 in words is "two hundred six billion, six hundred sixty-one million, two hundred fifteen thousand, six hundred seven".