634936661 has 8 divisors (see below), whose sum is σ = 680965920. Its totient is φ = 590168592.

The previous prime is 634936651. The next prime is 634936669. The reversal of 634936661 is 166639436.

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 634936661 - 2¹⁴ = 634920277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634936669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314255 + ... + 316268.

It is an arithmetic number, because the mean of its divisors is an integer number (85120740).

Almost surely, 2^634936661 is an apocalyptic number.

It is an amenable number.

634936661 is a deficient number, since it is larger than the sum of its proper divisors (46029259).

634936661 is a wasteful number, since it uses less digits than its factorization.

634936661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630595.

The product of its digits is 419904, while the sum is 44.

The square root of 634936661 is about 25197.9495395955. The cubic root of 634936661 is about 859.4952243323.

The spelling of 634936661 in words is "six hundred thirty-four million, nine hundred thirty-six thousand, six hundred sixty-one".