6621563744245 has 8 divisors (see below), whose sum is σ = 7963573325400. Its totient is φ = 5285453107200.

The previous prime is 6621563744219. The next prime is 6621563744281. The reversal of 6621563744245 is 5424473651266.

It can be written as a sum of positive squares in 4 ways, for example, as 1407132123076 + 5214431621169 = 1186226^2 + 2283513^2 .

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

It is not a de Polignac number, because 6621563744245 - 2¹⁷ = 6621563613173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1474733556 + ... + 1474738045.

It is an arithmetic number, because the mean of its divisors is an integer number (995446665675).

Almost surely, 2^{6621563744245} is an apocalyptic number.

It is an amenable number.

6621563744245 is a deficient number, since it is larger than the sum of its proper divisors (1342009581155).

6621563744245 is a wasteful number, since it uses less digits than its factorization.

6621563744245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949472055.

The product of its digits is 29030400, while the sum is 55.

The spelling of 6621563744245 in words is "six trillion, six hundred twenty-one billion, five hundred sixty-three million, seven hundred forty-four thousand, two hundred forty-five".