216400126550201 has 4 divisors (see below), whose sum is σ = 236072865327504. Its totient is φ = 196727387772900.

The previous prime is 216400126550039. The next prime is 216400126550203. The reversal of 216400126550201 is 102055621004612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216400126550201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216400126550203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9836369388635 + ... + 9836369388656.

It is an arithmetic number, because the mean of its divisors is an integer number (59018216331876).

Almost surely, 2^{216400126550201} is an apocalyptic number.

It is an amenable number.

216400126550201 is a deficient number, since it is larger than the sum of its proper divisors (19672738777303).

216400126550201 is a wasteful number, since it uses less digits than its factorization.

216400126550201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19672738777302.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 216400126550201 its reverse (102055621004612), we get a palindrome (318455747554813).

The spelling of 216400126550201 in words is "two hundred sixteen trillion, four hundred billion, one hundred twenty-six million, five hundred fifty thousand, two hundred one".