1641742642 has 4 divisors (see below), whose sum is σ = 2462613966. Its totient is φ = 820871320.

The previous prime is 1641742591. The next prime is 1641742723. The reversal of 1641742642 is 2462471461.

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

It can be written as a sum of positive squares in only one way, i.e., 1079056801 + 562685841 = 32849^2 + 23721^2 .

It is a super-2 number, since 2×1641742642² = 5390637805122280328, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 410435659 + ... + 410435662.

Almost surely, 2^1641742642 is an apocalyptic number.

1641742642 is a deficient number, since it is larger than the sum of its proper divisors (820871324).

1641742642 is an equidigital number, since it uses as much as digits as its factorization.

1641742642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820871323.

The product of its digits is 64512, while the sum is 37.

The square root of 1641742642 is about 40518.4234885811. The cubic root of 1641742642 is about 1179.6912536104.

The spelling of 1641742642 in words is "one billion, six hundred forty-one million, seven hundred forty-two thousand, six hundred forty-two".