2001555023323 has 4 divisors (see below), whose sum is σ = 2050373438568. Its totient is φ = 1952736608080.

The previous prime is 2001555023231. The next prime is 2001555023339. The reversal of 2001555023323 is 3233205551002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001555023323 is a prime.

It is a super-4 number, since 4×2001555023323⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001555023393) 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, 24409207561 + ... + 24409207642.

It is an arithmetic number, because the mean of its divisors is an integer number (512593359642).

Almost surely, 2^{2001555023323} is an apocalyptic number.

2001555023323 is a deficient number, since it is larger than the sum of its proper divisors (48818415245).

2001555023323 is an equidigital number, since it uses as much as digits as its factorization.

2001555023323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48818415244.

The product of its (nonzero) digits is 27000, while the sum is 31.

The spelling of 2001555023323 in words is "two trillion, one billion, five hundred fifty-five million, twenty-three thousand, three hundred twenty-three".