2187394778295 has 24 divisors (see below), whose sum is σ = 3791597758416. Its totient is φ = 1166575632768.

The previous prime is 2187394778279. The next prime is 2187394778347. The reversal of 2187394778295 is 5928774937812.

It is a happy number.

2187394778295 is a `hidden beast` number, since 2 + 1 + 8 + 7 + 394 + 77 + 82 + 95 = 666.

It is not a de Polignac number, because 2187394778295 - 2⁴ = 2187394778279 is a prime.

It is a super-2 number, since 2×2187394778295² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 829464 + ... + 2250066.

It is an arithmetic number, because the mean of its divisors is an integer number (157983239934).

Almost surely, 2^{2187394778295} is an apocalyptic number.

2187394778295 is a deficient number, since it is larger than the sum of its proper divisors (1604202980121).

2187394778295 is a wasteful number, since it uses less digits than its factorization.

2187394778295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454831 (or 1454828 counting only the distinct ones).

The product of its digits is 426746880, while the sum is 72.

The spelling of 2187394778295 in words is "two trillion, one hundred eighty-seven billion, three hundred ninety-four million, seven hundred seventy-eight thousand, two hundred ninety-five".