55555561628 has 36 divisors (see below), whose sum is σ = 114457877352. Its totient is φ = 23522657760.

The previous prime is 55555561627. The next prime is 55555561631. The reversal of 55555561628 is 82616555555.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55555561628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555561627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1691243 + ... + 1723778.

It is an arithmetic number, because the mean of its divisors is an integer number (3179385482).

Almost surely, 2^55555561628 is an apocalyptic number.

It is an amenable number.

55555561628 is an abundant number, since it is smaller than the sum of its proper divisors (58902315724).

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

55555561628 is a wasteful number, since it uses less digits than its factorization.

55555561628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415122 (or 3415113 counting only the distinct ones).

The product of its digits is 9000000, while the sum is 53.

The spelling of 55555561628 in words is "fifty-five billion, five hundred fifty-five million, five hundred sixty-one thousand, six hundred twenty-eight".