2621661271 has 8 divisors (see below), whose sum is σ = 2672863920. Its totient is φ = 2570523072.

The previous prime is 2621661247. The next prime is 2621661311. The reversal of 2621661271 is 1721661262.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2621661271 - 2⁹ = 2621660759 is a prime.

It is a super-4 number, since 4×2621661271⁴ (a number of 39 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621661571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70531 + ... + 101083.

It is an arithmetic number, because the mean of its divisors is an integer number (334107990).

Almost surely, 2^2621661271 is an apocalyptic number.

2621661271 is a deficient number, since it is larger than the sum of its proper divisors (51202649).

2621661271 is a wasteful number, since it uses less digits than its factorization.

2621661271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32225.

The product of its digits is 12096, while the sum is 34.

The square root of 2621661271 is about 51202.1608040129. The cubic root of 2621661271 is about 1378.8769956069.

Subtracting from 2621661271 its reverse (1721661262), we obtain a palindrome (900000009).

The spelling of 2621661271 in words is "two billion, six hundred twenty-one million, six hundred sixty-one thousand, two hundred seventy-one".