2665660500 has 72 divisors (see below), whose sum is σ = 8409284520. Its totient is φ = 710841600.

The previous prime is 2665660477. The next prime is 2665660553. The reversal of 2665660500 is 50665662.

It can be written as a sum of positive squares in 4 ways, for example, as 210656196 + 2455004304 = 14514^2 + 49548^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 291685 + ... + 300684.

Almost surely, 2^2665660500 is an apocalyptic number.

2665660500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2665660500 is an abundant number, since it is smaller than the sum of its proper divisors (5743624020).

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

2665660500 is a wasteful number, since it uses less digits than its factorization.

2665660500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592394 (or 592379 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 2665660500 is about 51630.0348634397. The cubic root of 2665660500 is about 1386.5481175105.

The spelling of 2665660500 in words is "two billion, six hundred sixty-five million, six hundred sixty thousand, five hundred".