2151838543823 has 4 divisors (see below), whose sum is σ = 2151883886520. Its totient is φ = 2151793201128.

The previous prime is 2151838543801. The next prime is 2151838543831. The reversal of 2151838543823 is 3283458381512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2151838543823 - 2²² = 2151834349519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151868543823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22600088 + ... + 22695101.

It is an arithmetic number, because the mean of its divisors is an integer number (537970971630).

Almost surely, 2^{2151838543823} is an apocalyptic number.

2151838543823 is a deficient number, since it is larger than the sum of its proper divisors (45342697).

2151838543823 is an equidigital number, since it uses as much as digits as its factorization.

2151838543823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45342696.

The product of its digits is 5529600, while the sum is 53.

The spelling of 2151838543823 in words is "two trillion, one hundred fifty-one billion, eight hundred thirty-eight million, five hundred forty-three thousand, eight hundred twenty-three".