634148661 has 24 divisors (see below), whose sum is σ = 878332000. Its totient is φ = 406678752.

The previous prime is 634148651. The next prime is 634148677. The reversal of 634148661 is 166841436.

It is not a de Polignac number, because 634148661 - 2⁵ = 634148629 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 (634148611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1270590 + ... + 1271088.

Almost surely, 2^634148661 is an apocalyptic number.

It is an amenable number.

634148661 is a deficient number, since it is larger than the sum of its proper divisors (244183339).

634148661 is a wasteful number, since it uses less digits than its factorization.

634148661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 646 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 634148661 is about 25182.3084922729. The cubic root of 634148661 is about 859.1395129381.

The spelling of 634148661 in words is "six hundred thirty-four million, one hundred forty-eight thousand, six hundred sixty-one".