201854545823 has 24 divisors (see below), whose sum is σ = 245217420000. Its totient is φ = 165361996800.

The previous prime is 201854545819. The next prime is 201854545847. The reversal of 201854545823 is 328545458102.

It is not a de Polignac number, because 201854545823 - 2² = 201854545819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201854545223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1335923 + ... + 1479323.

It is an arithmetic number, because the mean of its divisors is an integer number (10217392500).

Almost surely, 2^201854545823 is an apocalyptic number.

201854545823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

201854545823 is a deficient number, since it is larger than the sum of its proper divisors (43362874177).

201854545823 is a wasteful number, since it uses less digits than its factorization.

201854545823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144687 (or 144680 counting only the distinct ones).

The product of its (nonzero) digits is 1536000, while the sum is 47.

The spelling of 201854545823 in words is "two hundred one billion, eight hundred fifty-four million, five hundred forty-five thousand, eight hundred twenty-three".