634994558389 has 4 divisors (see below), whose sum is σ = 668415324640. Its totient is φ = 601573792140.

The previous prime is 634994558321. The next prime is 634994558413. The reversal of 634994558389 is 983855499436.

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 634994558389 - 2⁹ = 634994557877 is a prime.

It is a super-2 number, since 2×634994558389² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634994559389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16710383097 + ... + 16710383134.

It is an arithmetic number, because the mean of its divisors is an integer number (167103831160).

Almost surely, 2^634994558389 is an apocalyptic number.

It is an amenable number.

634994558389 is a deficient number, since it is larger than the sum of its proper divisors (33420766251).

634994558389 is a wasteful number, since it uses less digits than its factorization.

634994558389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33420766250.

The product of its digits is 1007769600, while the sum is 73.

The spelling of 634994558389 in words is "six hundred thirty-four billion, nine hundred ninety-four million, five hundred fifty-eight thousand, three hundred eighty-nine".