1660730727 has 4 divisors (see below), whose sum is σ = 2214307640. Its totient is φ = 1107153816.

The previous prime is 1660730723. The next prime is 1660730857. The reversal of 1660730727 is 7270370661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7270370661 = 3 ⋅2423456887.

It is not a de Polignac number, because 1660730727 - 2² = 1660730723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660730723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276788452 + ... + 276788457.

It is an arithmetic number, because the mean of its divisors is an integer number (553576910).

Almost surely, 2^1660730727 is an apocalyptic number.

1660730727 is a deficient number, since it is larger than the sum of its proper divisors (553576913).

1660730727 is an equidigital number, since it uses as much as digits as its factorization.

1660730727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553576912.

The product of its (nonzero) digits is 74088, while the sum is 39.

The square root of 1660730727 is about 40752.0640826940. The cubic root of 1660730727 is about 1184.2218601988.

The spelling of 1660730727 in words is "one billion, six hundred sixty million, seven hundred thirty thousand, seven hundred twenty-seven".