634185338849 has 4 divisors (see below), whose sum is σ = 635311778736. Its totient is φ = 633058898964.

The previous prime is 634185338837. The next prime is 634185338893. The reversal of 634185338849 is 948833581436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634185338849 - 2¹⁶ = 634185273313 is a prime.

It is a super-2 number, since 2×634185338849² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634185338791 and 634185338800.

It is not an unprimeable number, because it can be changed into a prime (634185338749) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 563219099 + ... + 563220224.

It is an arithmetic number, because the mean of its divisors is an integer number (158827944684).

Almost surely, 2^634185338849 is an apocalyptic number.

It is an amenable number.

634185338849 is a deficient number, since it is larger than the sum of its proper divisors (1126439887).

634185338849 is a wasteful number, since it uses less digits than its factorization.

634185338849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126439886.

The product of its digits is 59719680, while the sum is 62.

The spelling of 634185338849 in words is "six hundred thirty-four billion, one hundred eighty-five million, three hundred thirty-eight thousand, eight hundred forty-nine".