635912642139 has 16 divisors (see below), whose sum is σ = 854074340352. Its totient is φ = 420852384288.

The previous prime is 635912642137. The next prime is 635912642149. The reversal of 635912642139 is 931246219536.

It is not a de Polignac number, because 635912642139 - 2¹ = 635912642137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 635912642091 and 635912642100.

It is not an unprimeable number, because it can be changed into a prime (635912642137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331432 + ... + 1175445.

It is an arithmetic number, because the mean of its divisors is an integer number (53379646272).

Almost surely, 2^635912642139 is an apocalyptic number.

635912642139 is a deficient number, since it is larger than the sum of its proper divisors (218161698213).

635912642139 is a wasteful number, since it uses less digits than its factorization.

635912642139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507906.

The product of its digits is 2099520, while the sum is 51.

The spelling of 635912642139 in words is "six hundred thirty-five billion, nine hundred twelve million, six hundred forty-two thousand, one hundred thirty-nine".