206317038978 has 90 divisors (see below), whose sum is σ = 467636002713. Its totient is φ = 67988017440.

The previous prime is 206317038971. The next prime is 206317038979. The reversal of 206317038978 is 879830713602.

206317038978 is a `hidden beast` number, since 20 + 6 + 3 + 170 + 389 + 78 = 666.

206317038978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 199731229569 + 6585809409 = 446913^2 + 81153^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=321183.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (206317038971) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 734224198 + ... + 734224478.

Almost surely, 2^206317038978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206317038978

206317038978 is an abundant number, since it is smaller than the sum of its proper divisors (261318963735).

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

206317038978 is an frugal number, since it uses more digits than its factorization.

206317038978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 206317038978 in words is "two hundred six billion, three hundred seventeen million, thirty-eight thousand, nine hundred seventy-eight".