1665430528 has 44 divisors (see below), whose sum is σ = 3376272672. Its totient is φ = 820951040.

The previous prime is 1665430523. The next prime is 1665430573. The reversal of 1665430528 is 8250345661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665430523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61251 + ... + 84157.

Almost surely, 2^1665430528 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 1665430528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1688136336).

1665430528 is an abundant number, since it is smaller than the sum of its proper divisors (1710842144).

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

1665430528 is an equidigital number, since it uses as much as digits as its factorization.

1665430528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22998 (or 22980 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 1665430528 is about 40809.6866932350. The cubic root of 1665430528 is about 1185.3379081094.

The spelling of 1665430528 in words is "one billion, six hundred sixty-five million, four hundred thirty thousand, five hundred twenty-eight".