206978594638 has 8 divisors (see below), whose sum is σ = 310482605088. Its totient is φ = 103484392944.

The previous prime is 206978594609. The next prime is 206978594699. The reversal of 206978594638 is 836495879602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2399206 + ... + 2483977.

It is an arithmetic number, because the mean of its divisors is an integer number (38810325636).

Almost surely, 2^206978594638 is an apocalyptic number.

206978594638 is a deficient number, since it is larger than the sum of its proper divisors (103504010450).

206978594638 is a wasteful number, since it uses less digits than its factorization.

206978594638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4904378.

The product of its (nonzero) digits is 156764160, while the sum is 67.

The spelling of 206978594638 in words is "two hundred six billion, nine hundred seventy-eight million, five hundred ninety-four thousand, six hundred thirty-eight".