6616971605 has 16 divisors (see below), whose sum is σ = 7997572800. Its totient is φ = 5255564160.

The previous prime is 6616971601. The next prime is 6616971619. The reversal of 6616971605 is 5061796166.

It is a happy number.

It is not a de Polignac number, because 6616971605 - 2² = 6616971601 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6616971605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6616971601) 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, 434561 + ... + 449529.

It is an arithmetic number, because the mean of its divisors is an integer number (499848300).

Almost surely, 2^6616971605 is an apocalyptic number.

It is an amenable number.

6616971605 is a deficient number, since it is larger than the sum of its proper divisors (1380601195).

6616971605 is a wasteful number, since it uses less digits than its factorization.

6616971605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15604.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 6616971605 is about 81344.7699916842. The cubic root of 6616971605 is about 1877.3839051431.

The spelling of 6616971605 in words is "six billion, six hundred sixteen million, nine hundred seventy-one thousand, six hundred five".