2665709172 has 216 divisors, whose sum is σ = 8057527296. Its totient is φ = 740710656.

The previous prime is 2665709171. The next prime is 2665709209. The reversal of 2665709172 is 2719075662.

2665709172 is a `hidden beast` number, since 2 + 6 + 6 + 570 + 9 + 1 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665709171) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16353963 + ... + 16354125.

Almost surely, 2^2665709172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2665709172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4028763648).

2665709172 is an abundant number, since it is smaller than the sum of its proper divisors (5391818124).

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

2665709172 is a wasteful number, since it uses less digits than its factorization.

2665709172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 2665709172 is about 51630.5062148339. The cubic root of 2665709172 is about 1386.5565564020.

The spelling of 2665709172 in words is "two billion, six hundred sixty-five million, seven hundred nine thousand, one hundred seventy-two".