55121221606 has 12 divisors (see below), whose sum is σ = 90881683956. Its totient is φ = 25055100620.

The previous prime is 55121221567. The next prime is 55121221621. The reversal of 55121221606 is 60612212155.

It is a super-2 number, since 2×55121221606² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 113886580 + ... + 113887063.

It is an arithmetic number, because the mean of its divisors is an integer number (7573473663).

Almost surely, 2^55121221606 is an apocalyptic number.

55121221606 is a deficient number, since it is larger than the sum of its proper divisors (35760462350).

55121221606 is a wasteful number, since it uses less digits than its factorization.

55121221606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227773667 (or 227773656 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 55121221606 in words is "fifty-five billion, one hundred twenty-one million, two hundred twenty-one thousand, six hundred six".