55661000202 has 64 divisors (see below), whose sum is σ = 126368035200. Its totient is φ = 18383292144.

The previous prime is 55661000191. The next prime is 55661000237. The reversal of 55661000202 is 20200016655.

55661000202 is a `hidden beast` number, since 556 + 6 + 100 + 0 + 2 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 418393 + ... + 535139.

It is an arithmetic number, because the mean of its divisors is an integer number (1974500550).

Almost surely, 2^55661000202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55661000202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63184017600).

55661000202 is an abundant number, since it is smaller than the sum of its proper divisors (70707034998).

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

55661000202 is a wasteful number, since it uses less digits than its factorization.

55661000202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116879 (or 116861 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 55661000202 its reverse (20200016655), we get a palindrome (75861016857).

The spelling of 55661000202 in words is "fifty-five billion, six hundred sixty-one million, two hundred two", and thus it is an aban number.