201651243663 has 4 divisors (see below), whose sum is σ = 268868324888. Its totient is φ = 134434162440.

The previous prime is 201651243641. The next prime is 201651243713. The reversal of 201651243663 is 366342156102.

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

It is not a de Polignac number, because 201651243663 - 2⁸ = 201651243407 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 (201651243613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33608540608 + ... + 33608540613.

It is an arithmetic number, because the mean of its divisors is an integer number (67217081222).

Almost surely, 2^201651243663 is an apocalyptic number.

201651243663 is a deficient number, since it is larger than the sum of its proper divisors (67217081225).

201651243663 is an equidigital number, since it uses as much as digits as its factorization.

201651243663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67217081224.

The product of its (nonzero) digits is 155520, while the sum is 39.

Adding to 201651243663 its reverse (366342156102), we get a palindrome (567993399765).

The spelling of 201651243663 in words is "two hundred one billion, six hundred fifty-one million, two hundred forty-three thousand, six hundred sixty-three".