1665554500 has 24 divisors (see below), whose sum is σ = 3637572120. Its totient is φ = 666221600.

The previous prime is 1665554491. The next prime is 1665554507. The reversal of 1665554500 is 54555661.

It can be written as a sum of positive squares in 4 ways, for example, as 46457856 + 1619096644 = 6816^2 + 40238^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1665554500.

It is not an unprimeable number, because it can be changed into a prime (1665554507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1665055 + ... + 1666054.

It is an arithmetic number, because the mean of its divisors is an integer number (151565505).

Almost surely, 2^1665554500 is an apocalyptic number.

1665554500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665554500 is an abundant number, since it is smaller than the sum of its proper divisors (1972017620).

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

1665554500 is a wasteful number, since it uses less digits than its factorization.

1665554500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331128 (or 3331116 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 1665554500 is about 40811.2055690591. The cubic root of 1665554500 is about 1185.3673189359.

The spelling of 1665554500 in words is "one billion, six hundred sixty-five million, five hundred fifty-four thousand, five hundred".