635390801253 has 32 divisors (see below), whose sum is σ = 1057804097280. Its totient is φ = 374009296320.

The previous prime is 635390801233. The next prime is 635390801257. The reversal of 635390801253 is 352108093536.

It is a happy number.

635390801253 is a `hidden beast` number, since 6 + 3 + 5 + 390 + 8 + 0 + 1 + 253 = 666.

It is not a de Polignac number, because 635390801253 - 2⁹ = 635390800741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 635390801199 and 635390801208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635390801257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39344758 + ... + 39360903.

It is an arithmetic number, because the mean of its divisors is an integer number (33056378040).

Almost surely, 2^635390801253 is an apocalyptic number.

It is an amenable number.

635390801253 is a deficient number, since it is larger than the sum of its proper divisors (422413296027).

635390801253 is a wasteful number, since it uses less digits than its factorization.

635390801253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78705706 (or 78705700 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

Adding to 635390801253 its reverse (352108093536), we get a palindrome (987498894789).

The spelling of 635390801253 in words is "six hundred thirty-five billion, three hundred ninety million, eight hundred one thousand, two hundred fifty-three".