1610331665 has 8 divisors (see below), whose sum is σ = 1950127080. Its totient is φ = 1276445952.

The previous prime is 1610331661. The next prime is 1610331707. The reversal of 1610331665 is 5661330161.

It can be written as a sum of positive squares in 4 ways, for example, as 120912016 + 1489419649 = 10996^2 + 38593^2 .

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 1610331665 - 2² = 1610331661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1610331661) 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, 1476824 + ... + 1477913.

It is an arithmetic number, because the mean of its divisors is an integer number (243765885).

Almost surely, 2^1610331665 is an apocalyptic number.

It is an amenable number.

1610331665 is a deficient number, since it is larger than the sum of its proper divisors (339795415).

1610331665 is a wasteful number, since it uses less digits than its factorization.

1610331665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954851.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 1610331665 is about 40128.9379999023. The cubic root of 1610331665 is about 1172.1191935467.

The spelling of 1610331665 in words is "one billion, six hundred ten million, three hundred thirty-one thousand, six hundred sixty-five".