634378755685 has 8 divisors (see below), whose sum is σ = 761326299000. Its totient is φ = 507455143104.

The previous prime is 634378755677. The next prime is 634378755701. The reversal of 634378755685 is 586557873436.

It can be written as a sum of positive squares in 4 ways, for example, as 243204812964 + 391173942721 = 493158^2 + 625439^2 .

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 634378755685 - 2³ = 634378755677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634378755685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5924310 + ... + 6030439.

It is an arithmetic number, because the mean of its divisors is an integer number (95165787375).

Almost surely, 2^634378755685 is an apocalyptic number.

It is an amenable number.

634378755685 is a deficient number, since it is larger than the sum of its proper divisors (126947543315).

634378755685 is a wasteful number, since it uses less digits than its factorization.

634378755685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11965367.

The product of its digits is 508032000, while the sum is 67.

The spelling of 634378755685 in words is "six hundred thirty-four billion, three hundred seventy-eight million, seven hundred fifty-five thousand, six hundred eighty-five".