1665472400 has 30 divisors (see below), whose sum is σ = 4001298402. Its totient is φ = 666188800.

The previous prime is 1665472387. The next prime is 1665472409. The reversal of 1665472400 is 42745661.

It can be written as a sum of positive squares in 3 ways, for example, as 64192144 + 1601280256 = 8012^2 + 40016^2 .

It is not an unprimeable number, because it can be changed into a prime (1665472409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2081441 + ... + 2082240.

Almost surely, 2^1665472400 is an apocalyptic number.

1665472400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665472400 is an abundant number, since it is smaller than the sum of its proper divisors (2335826002).

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

1665472400 is a wasteful number, since it uses less digits than its factorization.

1665472400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163699 (or 4163688 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 1665472400 is about 40810.1997054658. The cubic root of 1665472400 is about 1185.3478418877.

The spelling of 1665472400 in words is "one billion, six hundred sixty-five million, four hundred seventy-two thousand, four hundred".