1665251442 has 24 divisors (see below), whose sum is σ = 3609375120. Its totient is φ = 554879160.

The previous prime is 1665251389. The next prime is 1665251443. The reversal of 1665251442 is 2441525661.

1665251442 is a `hidden beast` number, since 166 + 5 + 2 + 51 + 442 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1665251397 and 1665251406.

It is not an unprimeable number, because it can be changed into a prime (1665251443) 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, 37909 + ... + 69047.

It is an arithmetic number, because the mean of its divisors is an integer number (150390630).

Almost surely, 2^1665251442 is an apocalyptic number.

1665251442 is an abundant number, since it is smaller than the sum of its proper divisors (1944123678).

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

1665251442 is a wasteful number, since it uses less digits than its factorization.

1665251442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34118 (or 34115 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 1665251442 is about 40807.4924738093. The cubic root of 1665251442 is about 1185.2954195896.

The spelling of 1665251442 in words is "one billion, six hundred sixty-five million, two hundred fifty-one thousand, four hundred forty-two".