2621356641 has 16 divisors (see below), whose sum is σ = 4087886400. Its totient is φ = 1655593344.

The previous prime is 2621356637. The next prime is 2621356651. The reversal of 2621356641 is 1466531262.

2621356641 is a `hidden beast` number, since 2 + 6 + 2 + 1 + 3 + 5 + 6 + 641 = 666.

It is not a de Polignac number, because 2621356641 - 2² = 2621356637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2621356596 and 2621356605.

It is not an unprimeable number, because it can be changed into a prime (2621356651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2554416 + ... + 2555441.

It is an arithmetic number, because the mean of its divisors is an integer number (255492900).

Almost surely, 2^2621356641 is an apocalyptic number.

It is an amenable number.

2621356641 is a deficient number, since it is larger than the sum of its proper divisors (1466529759).

2621356641 is a wasteful number, since it uses less digits than its factorization.

2621356641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5109885 (or 5109879 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 2621356641 is about 51199.1859407940. The cubic root of 2621356641 is about 1378.8235862701.

The spelling of 2621356641 in words is "two billion, six hundred twenty-one million, three hundred fifty-six thousand, six hundred forty-one".