6619955553 has 8 divisors (see below), whose sum is σ = 9807341600. Its totient is φ = 4413303684.

The previous prime is 6619955467. The next prime is 6619955557. The reversal of 6619955553 is 3555599166.

It is not a de Polignac number, because 6619955553 - 2¹⁷ = 6619824481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6619955553.

It is not an unprimeable number, because it can be changed into a prime (6619955557) 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, 122591743 + ... + 122591796.

It is an arithmetic number, because the mean of its divisors is an integer number (1225917700).

Almost surely, 2^6619955553 is an apocalyptic number.

It is an amenable number.

6619955553 is a deficient number, since it is larger than the sum of its proper divisors (3187386047).

6619955553 is a wasteful number, since it uses less digits than its factorization.

6619955553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245183548 (or 245183542 counting only the distinct ones).

The product of its digits is 5467500, while the sum is 54.

The square root of 6619955553 is about 81363.1092879322. The cubic root of 6619955553 is about 1877.6660671557. Note that the first 3 decimals are identical.

The spelling of 6619955553 in words is "six billion, six hundred nineteen million, nine hundred fifty-five thousand, five hundred fifty-three".