2621400645 has 16 divisors (see below), whose sum is σ = 4414991040. Its totient is φ = 1324497024.

The previous prime is 2621400611. The next prime is 2621400667. The reversal of 2621400645 is 5460041262.

It is not a de Polignac number, because 2621400645 - 2⁸ = 2621400389 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 4598664 + ... + 4599233.

It is an arithmetic number, because the mean of its divisors is an integer number (275936940).

Almost surely, 2^2621400645 is an apocalyptic number.

It is an amenable number.

2621400645 is a deficient number, since it is larger than the sum of its proper divisors (1793590395).

2621400645 is a wasteful number, since it uses less digits than its factorization.

2621400645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9197924.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2621400645 is about 51199.6156723857. The cubic root of 2621400645 is about 1378.8313015389.

The spelling of 2621400645 in words is "two billion, six hundred twenty-one million, four hundred thousand, six hundred forty-five".