206997785748 has 54 divisors (see below), whose sum is σ = 563520767082. Its totient is φ = 63688597920.

The previous prime is 206997785707. The next prime is 206997785777. The reversal of 206997785748 is 847587799602.

It can be written as a sum of positive squares in only one way, i.e., 143306159364 + 63691626384 = 378558^2 + 252372^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9831993 + ... + 9853023.

Almost surely, 2^206997785748 is an apocalyptic number.

It is an amenable number.

206997785748 is an abundant number, since it is smaller than the sum of its proper divisors (356522981334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206997785748 is an equidigital number, since it uses as much as digits as its factorization.

206997785748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42085 (or 21049 counting only the distinct ones).

The product of its (nonzero) digits is 426746880, while the sum is 72.

The spelling of 206997785748 in words is "two hundred six billion, nine hundred ninety-seven million, seven hundred eighty-five thousand, seven hundred forty-eight".