1642660442 has 8 divisors (see below), whose sum is σ = 2476758036. Its totient is φ = 817074432.

The previous prime is 1642660441. The next prime is 1642660463. The reversal of 1642660442 is 2440662461.

It can be written as a sum of positive squares in 2 ways, for example, as 1623203521 + 19456921 = 40289^2 + 4411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1642660441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2127413 + ... + 2128184.

Almost surely, 2^1642660442 is an apocalyptic number.

1642660442 is a deficient number, since it is larger than the sum of its proper divisors (834097594).

1642660442 is a wasteful number, since it uses less digits than its factorization.

1642660442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255792.

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 1642660442 is about 40529.7476182618. The cubic root of 1642660442 is about 1179.9110442373.

The spelling of 1642660442 in words is "one billion, six hundred forty-two million, six hundred sixty thousand, four hundred forty-two".