1660665402 has 96 divisors (see below), whose sum is σ = 4108104000. Its totient is φ = 498597120.

The previous prime is 1660665401. The next prime is 1660665469. The reversal of 1660665402 is 2045660661.

It is a happy number.

1660665402 is a `hidden beast` number, since 1 + 6 + 606 + 6 + 5 + 40 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (1660665401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 602724 + ... + 605472.

It is an arithmetic number, because the mean of its divisors is an integer number (42792750).

Almost surely, 2^1660665402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660665402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2054052000).

1660665402 is an abundant number, since it is smaller than the sum of its proper divisors (2447438598).

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

1660665402 is a wasteful number, since it uses less digits than its factorization.

1660665402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1660665402 is about 40751.2625816673. The cubic root of 1660665402 is about 1184.2063328357.

The spelling of 1660665402 in words is "one billion, six hundred sixty million, six hundred sixty-five thousand, four hundred two".