100001555656 has 8 divisors (see below), whose sum is σ = 187502916870. Its totient is φ = 50000777824.

The previous prime is 100001555617. The next prime is 100001555659. The reversal of 100001555656 is 656555100001.

It can be written as a sum of positive squares in only one way, i.e., 65900024100 + 34101531556 = 256710^2 + 184666^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×100001555656² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100001555659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250097221 + ... + 6250097236.

Almost surely, 2^100001555656 is an apocalyptic number.

It is an amenable number.

100001555656 is a deficient number, since it is larger than the sum of its proper divisors (87501361214).

100001555656 is a wasteful number, since it uses less digits than its factorization.

100001555656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500194463 (or 12500194459 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 34.

Adding to 100001555656 its reverse (656555100001), we get a palindrome (756556655657).

The spelling of 100001555656 in words is "one hundred billion, one million, five hundred fifty-five thousand, six hundred fifty-six".