1662409851 has 4 divisors (see below), whose sum is σ = 2216546472. Its totient is φ = 1108273232.

The previous prime is 1662409841. The next prime is 1662409871. The reversal of 1662409851 is 1589042661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1662409851 - 2⁹ = 1662409339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1662409811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277068306 + ... + 277068311.

It is an arithmetic number, because the mean of its divisors is an integer number (554136618).

Almost surely, 2^1662409851 is an apocalyptic number.

1662409851 is a deficient number, since it is larger than the sum of its proper divisors (554136621).

1662409851 is an equidigital number, since it uses as much as digits as its factorization.

1662409851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554136620.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1662409851 is about 40772.6605827974. The cubic root of 1662409851 is about 1184.6208382975.

The spelling of 1662409851 in words is "one billion, six hundred sixty-two million, four hundred nine thousand, eight hundred fifty-one".