1661752919 has 8 divisors (see below), whose sum is σ = 1703167872. Its totient is φ = 1620380160.

The previous prime is 1661752903. The next prime is 1661752949. The reversal of 1661752919 is 9192571661.

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

It is a cyclic number.

It is not a de Polignac number, because 1661752919 - 2⁴ = 1661752903 is a prime.

It is a super-2 number, since 2×1661752919² = 5522845527610041122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661752949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78407 + ... + 97319.

It is an arithmetic number, because the mean of its divisors is an integer number (212895984).

Almost surely, 2^1661752919 is an apocalyptic number.

1661752919 is a deficient number, since it is larger than the sum of its proper divisors (41414953).

1661752919 is a wasteful number, since it uses less digits than its factorization.

1661752919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21097.

The product of its digits is 204120, while the sum is 47.

The square root of 1661752919 is about 40764.6037512938. The cubic root of 1661752919 is about 1184.4647761272.

The spelling of 1661752919 in words is "one billion, six hundred sixty-one million, seven hundred fifty-two thousand, nine hundred nineteen".