1665060400 has 60 divisors (see below), whose sum is σ = 4014243072. Its totient is φ = 663704320.

The previous prime is 1665060391. The next prime is 1665060403. The reversal of 1665060400 is 40605661.

It is a super-2 number, since 2×1665060400² = 5544852271296320000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1665060403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110097 + ... + 124303.

Almost surely, 2^1665060400 is an apocalyptic number.

1665060400 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 1665060400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2007121536).

1665060400 is an abundant number, since it is smaller than the sum of its proper divisors (2349182672).

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

1665060400 is a wasteful number, since it uses less digits than its factorization.

1665060400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14518 (or 14507 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1665060400 is about 40805.1516355472. The cubic root of 1665060400 is about 1185.2500911261.

The spelling of 1665060400 in words is "one billion, six hundred sixty-five million, sixty thousand, four hundred".