1661003642 has 8 divisors (see below), whose sum is σ = 2492449056. Its totient is φ = 830187292.

The previous prime is 1661003629. The next prime is 1661003711. The reversal of 1661003642 is 2463001661.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150608 + ... + 161259.

It is an arithmetic number, because the mean of its divisors is an integer number (311556132).

Almost surely, 2^1661003642 is an apocalyptic number.

1661003642 is a deficient number, since it is larger than the sum of its proper divisors (831445414).

1661003642 is a wasteful number, since it uses less digits than its factorization.

1661003642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314532.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1661003642 is about 40755.4124258362. The cubic root of 1661003642 is about 1184.2867260641.

The spelling of 1661003642 in words is "one billion, six hundred sixty-one million, three thousand, six hundred forty-two".