1661047642 has 8 divisors (see below), whose sum is σ = 2571944832. Its totient is φ = 803732700.

The previous prime is 1661047639. The next prime is 1661047651. The reversal of 1661047642 is 2467401661.

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

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 in 3 ways as a sum of consecutive naturals, for example, 13395484 + ... + 13395607.

It is an arithmetic number, because the mean of its divisors is an integer number (321493104).

Almost surely, 2^1661047642 is an apocalyptic number.

1661047642 is a deficient number, since it is larger than the sum of its proper divisors (910897190).

1661047642 is a wasteful number, since it uses less digits than its factorization.

1661047642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26791124.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 1661047642 is about 40755.9522278648. The cubic root of 1661047642 is about 1184.2971832268.

The spelling of 1661047642 in words is "one billion, six hundred sixty-one million, forty-seven thousand, six hundred forty-two".