6637845645 has 16 divisors (see below), whose sum is σ = 11800614720. Its totient is φ = 3540184272.

The previous prime is 6637845481. The next prime is 6637845649. The reversal of 6637845645 is 5465487366.

6637845645 is a `hidden beast` number, since 6 + 6 + 3 + 78 + 4 + 564 + 5 = 666.

It is not a de Polignac number, because 6637845645 - 2¹² = 6637841549 is a prime.

It is a super-3 number, since 3×6637845645³ (a number of 30 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6637845591 and 6637845600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6637845649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24584479 + ... + 24584748.

It is an arithmetic number, because the mean of its divisors is an integer number (737538420).

Almost surely, 2^6637845645 is an apocalyptic number.

It is an amenable number.

6637845645 is a deficient number, since it is larger than the sum of its proper divisors (5162769075).

6637845645 is a wasteful number, since it uses less digits than its factorization.

6637845645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49169241 (or 49169235 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The square root of 6637845645 is about 81472.9749364782. The cubic root of 6637845645 is about 1879.3559780063.

The spelling of 6637845645 in words is "six billion, six hundred thirty-seven million, eight hundred forty-five thousand, six hundred forty-five".