55128257715 has 16 divisors (see below), whose sum is σ = 90256497408. Its totient is φ = 28717975776.

The previous prime is 55128257699. The next prime is 55128257759. The reversal of 55128257715 is 51775282155.

It is not a de Polignac number, because 55128257715 - 2⁴ = 55128257699 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42734439 + ... + 42735728.

It is an arithmetic number, because the mean of its divisors is an integer number (5641031088).

Almost surely, 2^55128257715 is an apocalyptic number.

55128257715 is a deficient number, since it is larger than the sum of its proper divisors (35128239693).

55128257715 is a wasteful number, since it uses less digits than its factorization.

55128257715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85470218.

The product of its digits is 980000, while the sum is 48.

The spelling of 55128257715 in words is "fifty-five billion, one hundred twenty-eight million, two hundred fifty-seven thousand, seven hundred fifteen".