2187778458875 has 8 divisors (see below), whose sum is σ = 2730347516832. Its totient is φ = 1750222767000.

The previous prime is 2187778458829. The next prime is 2187778458907. The reversal of 2187778458875 is 5788548777812.

It is not a de Polignac number, because 2187778458875 - 2¹² = 2187778454779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2187778458796 and 2187778458805.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8751113711 + ... + 8751113960.

It is an arithmetic number, because the mean of its divisors is an integer number (341293439604).

Almost surely, 2^{2187778458875} is an apocalyptic number.

2187778458875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2187778458875 is a deficient number, since it is larger than the sum of its proper divisors (542569057957).

2187778458875 is an equidigital number, since it uses as much as digits as its factorization.

2187778458875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17502227686 (or 17502227676 counting only the distinct ones).

The product of its digits is 1966899200, while the sum is 77.

The spelling of 2187778458875 in words is "two trillion, one hundred eighty-seven billion, seven hundred seventy-eight million, four hundred fifty-eight thousand, eight hundred seventy-five".