206139978582 has 16 divisors (see below), whose sum is σ = 412285716480. Its totient is φ = 68712366312.

The previous prime is 206139978563. The next prime is 206139978589. The reversal of 206139978582 is 285879931602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206139978589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329163 + ... + 721545.

It is an arithmetic number, because the mean of its divisors is an integer number (25767857280).

Almost surely, 2^206139978582 is an apocalyptic number.

206139978582 is an abundant number, since it is smaller than the sum of its proper divisors (206145737898).

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

206139978582 is a wasteful number, since it uses less digits than its factorization.

206139978582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479947.

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 206139978582 in words is "two hundred six billion, one hundred thirty-nine million, nine hundred seventy-eight thousand, five hundred eighty-two".