16263654221 has 4 divisors (see below), whose sum is σ = 16263990012. Its totient is φ = 16263318432.

The previous prime is 16263654151. The next prime is 16263654241. The reversal of 16263654221 is 12245636261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12245636261 = 5011 ⋅2443751.

It can be written as a sum of positive squares in 2 ways, for example, as 3945096100 + 12318558121 = 62810^2 + 110989^2 .

It is a cyclic number.

It is not a de Polignac number, because 16263654221 - 2¹⁴ = 16263637837 is a prime.

It is a super-2 number, since 2×16263654221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16263654241) 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, 79856 + ... + 197241.

It is an arithmetic number, because the mean of its divisors is an integer number (4065997503).

Almost surely, 2^16263654221 is an apocalyptic number.

It is an amenable number.

16263654221 is a deficient number, since it is larger than the sum of its proper divisors (335791).

16263654221 is an equidigital number, since it uses as much as digits as its factorization.

16263654221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335790.

The product of its digits is 103680, while the sum is 38.

The spelling of 16263654221 in words is "sixteen billion, two hundred sixty-three million, six hundred fifty-four thousand, two hundred twenty-one".