1665710420 has 96 divisors (see below), whose sum is σ = 3907612800. Its totient is φ = 591321600.

The previous prime is 1665710407. The next prime is 1665710441. The reversal of 1665710420 is 240175661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2349026 + ... + 2349734.

It is an arithmetic number, because the mean of its divisors is an integer number (40704300).

Almost surely, 2^1665710420 is an apocalyptic number.

1665710420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665710420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1953806400).

1665710420 is an abundant number, since it is smaller than the sum of its proper divisors (2241902380).

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

1665710420 is a wasteful number, since it uses less digits than its factorization.

1665710420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 967 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1665710420 is about 40813.1157840222. The cubic root of 1665710420 is about 1185.4043069591.

The spelling of 1665710420 in words is "one billion, six hundred sixty-five million, seven hundred ten thousand, four hundred twenty".