55311261720 has 256 divisors, whose sum is σ = 196120673280. Its totient is φ = 12302592000.

The previous prime is 55311261713. The next prime is 55311261743. The reversal of 55311261720 is 2716211355.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2856070 + ... + 2875370.

It is an arithmetic number, because the mean of its divisors is an integer number (766096380).

Almost surely, 2^55311261720 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 55311261720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98060336640).

55311261720 is an abundant number, since it is smaller than the sum of its proper divisors (140809411560).

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

55311261720 is a wasteful number, since it uses less digits than its factorization.

55311261720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19506 (or 19502 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The spelling of 55311261720 in words is "fifty-five billion, three hundred eleven million, two hundred sixty-one thousand, seven hundred twenty".