2179878555 has 16 divisors (see below), whose sum is σ = 3508694784. Its totient is φ = 1155638880.

The previous prime is 2179878541. The next prime is 2179878557. The reversal of 2179878555 is 5558789712.

It is not a de Polignac number, because 2179878555 - 2⁴ = 2179878539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2179878495 and 2179878504.

It is not an unprimeable number, because it can be changed into a prime (2179878557) by changing a digit.

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, 432601 + ... + 437610.

It is an arithmetic number, because the mean of its divisors is an integer number (219293424).

Almost surely, 2^2179878555 is an apocalyptic number.

2179878555 is a deficient number, since it is larger than the sum of its proper divisors (1328816229).

2179878555 is a wasteful number, since it uses less digits than its factorization.

2179878555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870386.

The product of its digits is 7056000, while the sum is 57.

The square root of 2179878555 is about 46689.1695685413. The cubic root of 2179878555 is about 1296.6141785097.

The spelling of 2179878555 in words is "two billion, one hundred seventy-nine million, eight hundred seventy-eight thousand, five hundred fifty-five".