55551061020 has 192 divisors, whose sum is σ = 195890365440. Its totient is φ = 11448041472.

The previous prime is 55551060997. The next prime is 55551061021. The reversal of 55551061020 is 2016015555.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551061021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116476 + ... + 353084.

It is an arithmetic number, because the mean of its divisors is an integer number (1020262320).

Almost surely, 2^55551061020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55551061020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97945182720).

55551061020 is an abundant number, since it is smaller than the sum of its proper divisors (140339304420).

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

55551061020 is a wasteful number, since it uses less digits than its factorization.

55551061020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236684 (or 236682 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 55551061020 its reverse (2016015555), we get a palindrome (57567076575).

The spelling of 55551061020 in words is "fifty-five billion, five hundred fifty-one million, sixty-one thousand, twenty".