42639512186 has 4 divisors (see below), whose sum is σ = 63959268282. Its totient is φ = 21319756092.

The previous prime is 42639512173. The next prime is 42639512191. The reversal of 42639512186 is 68121593624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 40390950625 + 2248561561 = 200975^2 + 47419^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42639512186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10659878045 + ... + 10659878048.

Almost surely, 2^42639512186 is an apocalyptic number.

42639512186 is a deficient number, since it is larger than the sum of its proper divisors (21319756096).

42639512186 is a wasteful number, since it uses less digits than its factorization.

42639512186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21319756095.

The product of its digits is 622080, while the sum is 47.

The spelling of 42639512186 in words is "forty-two billion, six hundred thirty-nine million, five hundred twelve thousand, one hundred eighty-six".