206934537985 has 32 divisors (see below), whose sum is σ = 289554600960. Its totient is φ = 139026121728.

The previous prime is 206934537919. The next prime is 206934537989. The reversal of 206934537985 is 589735439602.

It is a cyclic number.

It is not a de Polignac number, because 206934537985 - 2⁹ = 206934537473 is a prime.

It is a super-2 number, since 2×206934537985² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206934537989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1256169 + ... + 1411321.

It is an arithmetic number, because the mean of its divisors is an integer number (9048581280).

Almost surely, 2^206934537985 is an apocalyptic number.

It is an amenable number.

206934537985 is a deficient number, since it is larger than the sum of its proper divisors (82620062975).

206934537985 is a wasteful number, since it uses less digits than its factorization.

206934537985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155937.

The product of its (nonzero) digits is 48988800, while the sum is 61.

The spelling of 206934537985 in words is "two hundred six billion, nine hundred thirty-four million, five hundred thirty-seven thousand, nine hundred eighty-five".