634043366031521 has 8 divisors (see below), whose sum is σ = 645987580859304. Its totient is φ = 622210260179200.

The previous prime is 634043366031433. The next prime is 634043366031529. The reversal of 634043366031521 is 125130663340436.

It can be written as a sum of positive squares in 4 ways, for example, as 113170469461921 + 520872896569600 = 10638161^2 + 22822640^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 634043366031521 - 2¹⁰ = 634043366030497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634043366031529) 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 7 ways as a sum of consecutive naturals, for example, 27777232346 + ... + 27777255171.

It is an arithmetic number, because the mean of its divisors is an integer number (80748447607413).

Almost surely, 2^{634043366031521} is an apocalyptic number.

It is an amenable number.

634043366031521 is a deficient number, since it is larger than the sum of its proper divisors (11944214827783).

634043366031521 is a wasteful number, since it uses less digits than its factorization.

634043366031521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55554487731.

The product of its (nonzero) digits is 2799360, while the sum is 47.

The spelling of 634043366031521 in words is "six hundred thirty-four trillion, forty-three billion, three hundred sixty-six million, thirty-one thousand, five hundred twenty-one".