634015434561 has 4 divisors (see below), whose sum is σ = 845353912752. Its totient is φ = 422676956372.

The previous prime is 634015434529. The next prime is 634015434587. The reversal of 634015434561 is 165434510436.

It is a happy number.

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 634015434561 - 2⁵ = 634015434529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634015434161) 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, 105669239091 + ... + 105669239096.

It is an arithmetic number, because the mean of its divisors is an integer number (211338478188).

Almost surely, 2^634015434561 is an apocalyptic number.

It is an amenable number.

634015434561 is a deficient number, since it is larger than the sum of its proper divisors (211338478191).

634015434561 is a wasteful number, since it uses less digits than its factorization.

634015434561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211338478190.

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 634015434561 its reverse (165434510436), we get a palindrome (799449944997).

The spelling of 634015434561 in words is "six hundred thirty-four billion, fifteen million, four hundred thirty-four thousand, five hundred sixty-one".