2155868813387 has 16 divisors (see below), whose sum is σ = 2299048980480. Its totient is φ = 2016869666592.

The previous prime is 2155868813363. The next prime is 2155868813459. The reversal of 2155868813387 is 7833188685512.

It is not a de Polignac number, because 2155868813387 - 2¹⁴ = 2155868797003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155868813347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 884414 + ... + 2256972.

It is an arithmetic number, because the mean of its divisors is an integer number (143690561280).

Almost surely, 2^{2155868813387} is an apocalyptic number.

2155868813387 is a deficient number, since it is larger than the sum of its proper divisors (143180167093).

2155868813387 is a wasteful number, since it uses less digits than its factorization.

2155868813387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374082.

The product of its digits is 77414400, while the sum is 65.

The spelling of 2155868813387 in words is "two trillion, one hundred fifty-five billion, eight hundred sixty-eight million, eight hundred thirteen thousand, three hundred eighty-seven".