1661009242 has 8 divisors (see below), whose sum is σ = 2638073556. Its totient is φ = 781651392.

The previous prime is 1661009219. The next prime is 1661009263. The reversal of 1661009242 is 2429001661.

It can be written as a sum of positive squares in 2 ways, for example, as 1617567961 + 43441281 = 40219^2 + 6591^2 .

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, 24426573 + ... + 24426640.

Almost surely, 2^1661009242 is an apocalyptic number.

1661009242 is a deficient number, since it is larger than the sum of its proper divisors (977064314).

1661009242 is a wasteful number, since it uses less digits than its factorization.

1661009242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48853232.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1661009242 is about 40755.4811283096. The cubic root of 1661009242 is about 1184.2880569860.

The spelling of 1661009242 in words is "one billion, six hundred sixty-one million, nine thousand, two hundred forty-two".