16215266251261 has 16 divisors (see below), whose sum is σ = 20216640711168. Its totient is φ = 12635144362800.

The previous prime is 16215266251159. The next prime is 16215266251271.

16215266251261 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 16215266251261 - 2²¹ = 16215264154109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16215266251271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6971526 + ... + 9001816.

It is an arithmetic number, because the mean of its divisors is an integer number (1263540044448).

Almost surely, 2^{16215266251261} is an apocalyptic number.

16215266251261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16215266251261 is a deficient number, since it is larger than the sum of its proper divisors (4001374459907).

16215266251261 is a wasteful number, since it uses less digits than its factorization.

16215266251261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134032.

The product of its digits is 518400, while the sum is 46.

It can be divided in two parts, 1621526 and 6251261, that added together give a palindrome (7872787).

The spelling of 16215266251261 in words is "sixteen trillion, two hundred fifteen billion, two hundred sixty-six million, two hundred fifty-one thousand, two hundred sixty-one".