7421755565816 has 16 divisors (see below), whose sum is σ = 13916083473600. Its totient is φ = 3710799972864.

The previous prime is 7421755565813. The next prime is 7421755565839. The reversal of 7421755565816 is 6185655571247.

It is a happy number.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421755565813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9319880 + ... + 10084823.

It is an arithmetic number, because the mean of its divisors is an integer number (869755217100).

Almost surely, 2^{7421755565816} is an apocalyptic number.

It is an amenable number.

7421755565816 is a deficient number, since it is larger than the sum of its proper divisors (6494327907784).

7421755565816 is a wasteful number, since it uses less digits than its factorization.

7421755565816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19452518 (or 19452514 counting only the distinct ones).

The product of its digits is 70560000, while the sum is 62.

The spelling of 7421755565816 in words is "seven trillion, four hundred twenty-one billion, seven hundred fifty-five million, five hundred sixty-five thousand, eight hundred sixteen".