2665649358 has 64 divisors (see below), whose sum is σ = 6080558400. Its totient is φ = 865105920.

The previous prime is 2665649353. The next prime is 2665649381. The reversal of 2665649358 is 8539465662.

2665649358 is a `hidden beast` number, since 26 + 6 + 564 + 9 + 3 + 58 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665649353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1489128 + ... + 1490916.

It is an arithmetic number, because the mean of its divisors is an integer number (95008725).

Almost surely, 2^2665649358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2665649358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3040279200).

2665649358 is an abundant number, since it is smaller than the sum of its proper divisors (3414909042).

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

2665649358 is a wasteful number, since it uses less digits than its factorization.

2665649358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2514 (or 2508 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The square root of 2665649358 is about 51629.9269610175. The cubic root of 2665649358 is about 1386.5461856640.

The spelling of 2665649358 in words is "two billion, six hundred sixty-five million, six hundred forty-nine thousand, three hundred fifty-eight".