634432233121261 has 12 divisors (see below), whose sum is σ = 663321310650880. Its totient is φ = 606751449246360.

The previous prime is 634432233121201. The next prime is 634432233121279. The reversal of 634432233121261 is 162121332234436.

It is not a de Polignac number, because 634432233121261 - 2²³ = 634432224732653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634432233121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92305731 + ... + 98940448.

Almost surely, 2^{634432233121261} is an apocalyptic number.

It is an amenable number.

634432233121261 is a deficient number, since it is larger than the sum of its proper divisors (28889077529619).

634432233121261 is a wasteful number, since it uses less digits than its factorization.

634432233121261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191252496 (or 191252473 counting only the distinct ones).

The product of its digits is 746496, while the sum is 43.

Adding to 634432233121261 its reverse (162121332234436), we get a palindrome (796553565355697).

The spelling of 634432233121261 in words is "six hundred thirty-four trillion, four hundred thirty-two billion, two hundred thirty-three million, one hundred twenty-one thousand, two hundred sixty-one".