1606750661 has 4 divisors (see below), whose sum is σ = 1629381024. Its totient is φ = 1584120300.

The previous prime is 1606750643. The next prime is 1606750679. The reversal of 1606750661 is 1660576061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1606750643) and next prime (1606750679).

It is a cyclic number.

It is not a de Polignac number, because 1606750661 - 2¹⁸ = 1606488517 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 (1606750861) 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, 11315075 + ... + 11315216.

It is an arithmetic number, because the mean of its divisors is an integer number (407345256).

Almost surely, 2^1606750661 is an apocalyptic number.

It is an amenable number.

1606750661 is a deficient number, since it is larger than the sum of its proper divisors (22630363).

1606750661 is an equidigital number, since it uses as much as digits as its factorization.

1606750661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22630362.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1606750661 is about 40084.2944430858. The cubic root of 1606750661 is about 1171.2497083381.

The spelling of 1606750661 in words is "one billion, six hundred six million, seven hundred fifty thousand, six hundred sixty-one".