634138981245 has 512 divisors, whose sum is σ = 1535592038400. Its totient is φ = 240353049600.

The previous prime is 634138981163. The next prime is 634138981309. The reversal of 634138981245 is 542189831436.

It is a happy number.

It is not a de Polignac number, because 634138981245 - 2¹¹ = 634138979197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634138981191 and 634138981200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 781921890 + ... + 781922700.

It is an arithmetic number, because the mean of its divisors is an integer number (2999203200).

Almost surely, 2^634138981245 is an apocalyptic number.

It is an amenable number.

634138981245 is an abundant number, since it is smaller than the sum of its proper divisors (901453057155).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634138981245 is a wasteful number, since it uses less digits than its factorization.

634138981245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 1000 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 634138981245 in words is "six hundred thirty-four billion, one hundred thirty-eight million, nine hundred eighty-one thousand, two hundred forty-five".