639863986137 has 8 divisors (see below), whose sum is σ = 853242405120. Its totient is φ = 426530778960.

The previous prime is 639863986133. The next prime is 639863986141. The reversal of 639863986137 is 731689368936.

It is an interprime number because it is at equal distance from previous prime (639863986133) and next prime (639863986141).

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

It is not a de Polignac number, because 639863986137 - 2² = 639863986133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639863986133) 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, 11269914 + ... + 11326547.

It is an arithmetic number, because the mean of its divisors is an integer number (106655300640).

Almost surely, 2^639863986137 is an apocalyptic number.

It is an amenable number.

639863986137 is a deficient number, since it is larger than the sum of its proper divisors (213378418983).

639863986137 is a wasteful number, since it uses less digits than its factorization.

639863986137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22605903.

The product of its digits is 211631616, while the sum is 69.

The spelling of 639863986137 in words is "six hundred thirty-nine billion, eight hundred sixty-three million, nine hundred eighty-six thousand, one hundred thirty-seven".