635473631556 has 135 divisors (see below), whose sum is σ = 1688973674157. Its totient is φ = 208347305760.

The previous prime is 635473631543. The next prime is 635473631579. The reversal of 635473631556 is 655136374536.

The square root of 635473631556 is 797166.

It is a perfect power (a square), and thus also a powerful number.

635473631556 is a `hidden beast` number, since 6 + 3 + 54 + 7 + 3 + 6 + 31 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 504574391556 + 130899240000 = 710334^2 + 361800^2 .

It is a super-2 number, since 2×635473631556² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 961381866 + ... + 961382526.

Almost surely, 2^635473631556 is an apocalyptic number.

635473631556 is the 797166-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 635473631556

635473631556 is an abundant number, since it is smaller than the sum of its proper divisors (1053500042601).

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

635473631556 is an frugal number, since it uses more digits than its factorization.

635473631556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472 (or 733 counting only the distinct ones).

The product of its digits is 20412000, while the sum is 54.

The spelling of 635473631556 in words is "six hundred thirty-five billion, four hundred seventy-three million, six hundred thirty-one thousand, five hundred fifty-six".