1661090894 has 8 divisors (see below), whose sum is σ = 2514495720. Its totient is φ = 822925656.

The previous prime is 1661090891. The next prime is 1661090909. The reversal of 1661090894 is 4980901661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661090891) by changing a digit.

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, 3809624 + ... + 3810059.

It is an arithmetic number, because the mean of its divisors is an integer number (314311965).

Almost surely, 2^1661090894 is an apocalyptic number.

1661090894 is a deficient number, since it is larger than the sum of its proper divisors (853404826).

1661090894 is a wasteful number, since it uses less digits than its factorization.

1661090894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619794.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1661090894 is about 40756.4828462908. The cubic root of 1661090894 is about 1184.3074624377.

The spelling of 1661090894 in words is "one billion, six hundred sixty-one million, ninety thousand, eight hundred ninety-four".