2621016641 has 4 divisors (see below), whose sum is σ = 2634321492. Its totient is φ = 2607711792.

The previous prime is 2621016637. The next prime is 2621016647. The reversal of 2621016641 is 1466101262.

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 1373443600 + 1247573041 = 37060^2 + 35321^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621016641 - 2² = 2621016637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621016647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6652130 + ... + 6652523.

It is an arithmetic number, because the mean of its divisors is an integer number (658580373).

Almost surely, 2^2621016641 is an apocalyptic number.

It is an amenable number.

2621016641 is a deficient number, since it is larger than the sum of its proper divisors (13304851).

2621016641 is a wasteful number, since it uses less digits than its factorization.

2621016641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13304850.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 2621016641 is about 51195.8654678286. The cubic root of 2621016641 is about 1378.7639707919.

The spelling of 2621016641 in words is "two billion, six hundred twenty-one million, sixteen thousand, six hundred forty-one".