63555521606 has 16 divisors (see below), whose sum is σ = 96105246720. Its totient is φ = 31520550600.

The previous prime is 63555521539. The next prime is 63555521609. The reversal of 63555521606 is 60612555536.

It is a super-3 number, since 3×63555521606³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63555521609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232285 + ... + 1282823.

It is an arithmetic number, because the mean of its divisors is an integer number (6006577920).

Almost surely, 2^63555521606 is an apocalyptic number.

63555521606 is a deficient number, since it is larger than the sum of its proper divisors (32549725114).

63555521606 is a wasteful number, since it uses less digits than its factorization.

63555521606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55619.

The product of its (nonzero) digits is 810000, while the sum is 44.

The spelling of 63555521606 in words is "sixty-three billion, five hundred fifty-five million, five hundred twenty-one thousand, six hundred six".