6558994644 has 12 divisors (see below), whose sum is σ = 15304320864. Its totient is φ = 2186331544.

The previous prime is 6558994643. The next prime is 6558994657. The reversal of 6558994644 is 4464998556.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (60) 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 (6558994643) 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, 273291432 + ... + 273291455.

It is an arithmetic number, because the mean of its divisors is an integer number (1275360072).

Almost surely, 2^6558994644 is an apocalyptic number.

It is an amenable number.

6558994644 is an abundant number, since it is smaller than the sum of its proper divisors (8745326220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6558994644 is a wasteful number, since it uses less digits than its factorization.

6558994644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546582894 (or 546582892 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 60.

The square root of 6558994644 is about 80987.6203132306. The cubic root of 6558994644 is about 1871.8846893232.

The spelling of 6558994644 in words is "six billion, five hundred fifty-eight million, nine hundred ninety-four thousand, six hundred forty-four".