635724696673 has 6 divisors (see below), whose sum is σ = 698771774162. Its totient is φ = 577931542320.

The previous prime is 635724696643. The next prime is 635724696701. The reversal of 635724696673 is 376696427536.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 633762472464 + 1962224209 = 796092^2 + 44297^2 .

It is not a de Polignac number, because 635724696673 - 2⁹ = 635724696161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (635724696643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2626961436 + ... + 2626961677.

Almost surely, 2^635724696673 is an apocalyptic number.

It is an amenable number.

635724696673 is a deficient number, since it is larger than the sum of its proper divisors (63047077489).

635724696673 is a wasteful number, since it uses less digits than its factorization.

635724696673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253923135 (or 5253923124 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 64.

The spelling of 635724696673 in words is "six hundred thirty-five billion, seven hundred twenty-four million, six hundred ninety-six thousand, six hundred seventy-three".