6209991612 has 72 divisors (see below), whose sum is σ = 17210793600. Its totient is φ = 1872335520.

The previous prime is 6209991611. The next prime is 6209991617. The reversal of 6209991612 is 2161999026.

6209991612 is a `hidden beast` number, since 6 + 20 + 9 + 9 + 9 + 1 + 612 = 666.

It is a super-2 number, since 2×6209991612² = 77127991642220717088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6209991611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39403 + ... + 118205.

It is an arithmetic number, because the mean of its divisors is an integer number (239038800).

Almost surely, 2^6209991612 is an apocalyptic number.

It is a pronic number, being equal to 78803×78804.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6209991612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8605396800).

6209991612 is an abundant number, since it is smaller than the sum of its proper divisors (11000801988).

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

6209991612 is a wasteful number, since it uses less digits than its factorization.

6209991612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79023 (or 79018 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 6209991612 is about 78803.4999984138. The cubic root of 6209991612 is about 1838.0768749892.

The spelling of 6209991612 in words is "six billion, two hundred nine million, nine hundred ninety-one thousand, six hundred twelve".