634196868685 has 4 divisors (see below), whose sum is σ = 761036242428. Its totient is φ = 507357494944.

The previous prime is 634196868623. The next prime is 634196868733. The reversal of 634196868685 is 586868691436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 475102782729 + 159094085956 = 689277^2 + 398866^2 .

It is a cyclic number.

It is not a de Polignac number, because 634196868685 - 2¹⁷ = 634196737613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 63419686864 + ... + 63419686873.

It is an arithmetic number, because the mean of its divisors is an integer number (190259060607).

Almost surely, 2^634196868685 is an apocalyptic number.

It is an amenable number.

634196868685 is a deficient number, since it is larger than the sum of its proper divisors (126839373743).

634196868685 is a wasteful number, since it uses less digits than its factorization.

634196868685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126839373742.

The product of its digits is 358318080, while the sum is 70.

The spelling of 634196868685 in words is "six hundred thirty-four billion, one hundred ninety-six million, eight hundred sixty-eight thousand, six hundred eighty-five".