1660351661 has 8 divisors (see below), whose sum is σ = 1719976704. Its totient is φ = 1601105760.

The previous prime is 1660351643. The next prime is 1660351663. The reversal of 1660351661 is 1661530661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660351661 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 (1660351663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85856 + ... + 103401.

It is an arithmetic number, because the mean of its divisors is an integer number (214997088).

Almost surely, 2^1660351661 is an apocalyptic number.

It is an amenable number.

1660351661 is a deficient number, since it is larger than the sum of its proper divisors (59625043).

1660351661 is a wasteful number, since it uses less digits than its factorization.

1660351661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189571.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1660351661 is about 40747.4129362835. The cubic root of 1660351661 is about 1184.1317527952.

The spelling of 1660351661 in words is "one billion, six hundred sixty million, three hundred fifty-one thousand, six hundred sixty-one".