55213077920 has 384 divisors, whose sum is σ = 178136340480. Its totient is φ = 15613562880.

The previous prime is 55213077919. The next prime is 55213077943. The reversal of 55213077920 is 2977031255.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9446519 + ... + 9452361.

It is an arithmetic number, because the mean of its divisors is an integer number (463896720).

Almost surely, 2^55213077920 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 55213077920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89068170240).

55213077920 is an abundant number, since it is smaller than the sum of its proper divisors (122923262560).

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

55213077920 is a wasteful number, since it uses less digits than its factorization.

55213077920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5948 (or 5940 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 41.

The spelling of 55213077920 in words is "fifty-five billion, two hundred thirteen million, seventy-seven thousand, nine hundred twenty".