6645062251442 has 16 divisors (see below), whose sum is σ = 10237725798552. Its totient is φ = 3232499932800.

The previous prime is 6645062251441. The next prime is 6645062251469. The reversal of 6645062251442 is 2441522605466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6644893017361 + 169234081 = 2577769^2 + 13009^2 .

It is not an unprimeable number, because it can be changed into a prime (6645062251441) 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, 2201243 + ... + 4258590.

Almost surely, 2^{6645062251442} is an apocalyptic number.

6645062251442 is a deficient number, since it is larger than the sum of its proper divisors (3592663547110).

6645062251442 is a wasteful number, since it uses less digits than its factorization.

6645062251442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6473773.

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 6645062251442 in words is "six trillion, six hundred forty-five billion, sixty-two million, two hundred fifty-one thousand, four hundred forty-two".