1661384794 has 8 divisors (see below), whose sum is σ = 2496118068. Its totient is φ = 829345440.

The previous prime is 1661384761. The next prime is 1661384801. The reversal of 1661384794 is 4974831661.

It can be written as a sum of positive squares in 2 ways, for example, as 1579029169 + 82355625 = 39737^2 + 9075^2 .

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, 671937 + ... + 674404.

Almost surely, 2^1661384794 is an apocalyptic number.

1661384794 is a deficient number, since it is larger than the sum of its proper divisors (834733274).

1661384794 is a wasteful number, since it uses less digits than its factorization.

1661384794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346960.

The product of its digits is 870912, while the sum is 49.

The square root of 1661384794 is about 40760.0882481871. The cubic root of 1661384794 is about 1184.3773055828.

The spelling of 1661384794 in words is "one billion, six hundred sixty-one million, three hundred eighty-four thousand, seven hundred ninety-four".