55120133502 has 128 divisors (see below), whose sum is σ = 149132390400. Its totient is φ = 14739820128.

The previous prime is 55120133477. The next prime is 55120133531. The reversal of 55120133502 is 20533102155.

It is a happy number.

55120133502 is a `hidden beast` number, since 5 + 5 + 1 + 20 + 133 + 502 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 549873 + ... + 642339.

It is an arithmetic number, because the mean of its divisors is an integer number (1165096800).

Almost surely, 2^55120133502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55120133502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74566195200).

55120133502 is an abundant number, since it is smaller than the sum of its proper divisors (94012256898).

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

55120133502 is a wasteful number, since it uses less digits than its factorization.

55120133502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92587 (or 92581 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 55120133502 its reverse (20533102155), we get a palindrome (75653235657).

The spelling of 55120133502 in words is "fifty-five billion, one hundred twenty million, one hundred thirty-three thousand, five hundred two".