55136623280 has 80 divisors (see below), whose sum is σ = 129388385280. Its totient is φ = 21849440256.

The previous prime is 55136623273. The next prime is 55136623303. The reversal of 55136623280 is 8232663155.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7809512 + ... + 7816568.

It is an arithmetic number, because the mean of its divisors is an integer number (1617354816).

Almost surely, 2^55136623280 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 55136623280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64694192640).

55136623280 is an abundant number, since it is smaller than the sum of its proper divisors (74251762000).

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

55136623280 is a wasteful number, since it uses less digits than its factorization.

55136623280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7966 (or 7960 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 55136623280 in words is "fifty-five billion, one hundred thirty-six million, six hundred twenty-three thousand, two hundred eighty".