1662161642 has 4 divisors (see below), whose sum is σ = 2493242466. Its totient is φ = 831080820.

The previous prime is 1662161623. The next prime is 1662161671. The reversal of 1662161642 is 2461612661.

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., 1258191841 + 403969801 = 35471^2 + 20099^2 .

It is a super-2 number, since 2×1662161642² = 5525562648272272328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415540409 + ... + 415540412.

Almost surely, 2^1662161642 is an apocalyptic number.

1662161642 is a deficient number, since it is larger than the sum of its proper divisors (831080824).

1662161642 is an equidigital number, since it uses as much as digits as its factorization.

1662161642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831080823.

The product of its digits is 20736, while the sum is 35.

The square root of 1662161642 is about 40769.6166526005. The cubic root of 1662161642 is about 1184.5618780701.

The spelling of 1662161642 in words is "one billion, six hundred sixty-two million, one hundred sixty-one thousand, six hundred forty-two".