635221101056 has 80 divisors (see below), whose sum is σ = 1284211805184. Its totient is φ = 313876475904.

The previous prime is 635221101017. The next prime is 635221101061. The reversal of 635221101056 is 650101122536.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14770721 + ... + 14813663.

Almost surely, 2^635221101056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 635221101056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642105902592).

635221101056 is an abundant number, since it is smaller than the sum of its proper divisors (648990704128).

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

635221101056 is a wasteful number, since it uses less digits than its factorization.

635221101056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43301 (or 43285 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 635221101056 in words is "six hundred thirty-five billion, two hundred twenty-one million, one hundred one thousand, fifty-six".