2157178268889 has 24 divisors (see below), whose sum is σ = 3561167891840. Its totient is φ = 1232634630528.

The previous prime is 2157178268887. The next prime is 2157178268911. The reversal of 2157178268889 is 9888628717512.

2157178268889 is a `hidden beast` number, since 21 + 571 + 7 + 8 + 26 + 8 + 8 + 8 + 9 = 666.

It is not a de Polignac number, because 2157178268889 - 2¹ = 2157178268887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157178268887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1551297 + ... + 2592465.

Almost surely, 2^{2157178268889} is an apocalyptic number.

It is an amenable number.

2157178268889 is a deficient number, since it is larger than the sum of its proper divisors (1403989622951).

2157178268889 is a wasteful number, since it uses less digits than its factorization.

2157178268889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074069 (or 1074066 counting only the distinct ones).

The product of its digits is 216760320, while the sum is 72.

The spelling of 2157178268889 in words is "two trillion, one hundred fifty-seven billion, one hundred seventy-eight million, two hundred sixty-eight thousand, eight hundred eighty-nine".