16271553601 has 4 divisors (see below), whose sum is σ = 16668420804. Its totient is φ = 15874686400.

The previous prime is 16271553541. The next prime is 16271553611. The reversal of 16271553601 is 10635517261.

It is a Cunningham number, because it is equal to 127560²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 784000000 + 15487553601 = 28000^2 + 124449^2 .

It is a cyclic number.

It is not a de Polignac number, because 16271553601 - 2¹⁵ = 16271520833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16271553611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198433540 + ... + 198433621.

It is an arithmetic number, because the mean of its divisors is an integer number (4167105201).

Almost surely, 2^16271553601 is an apocalyptic number.

It is an amenable number.

16271553601 is a deficient number, since it is larger than the sum of its proper divisors (396867203).

16271553601 is an equidigital number, since it uses as much as digits as its factorization.

16271553601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396867202.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 16271553601 in words is "sixteen billion, two hundred seventy-one million, five hundred fifty-three thousand, six hundred one".