1650608661 has 16 divisors (see below), whose sum is σ = 2371550720. Its totient is φ = 1015139520.

The previous prime is 1650608657. The next prime is 1650608669. The reversal of 1650608661 is 1668060561.

It is not a de Polignac number, because 1650608661 - 2² = 1650608657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650608669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56571 + ... + 80631.

It is an arithmetic number, because the mean of its divisors is an integer number (148221920).

Almost surely, 2^1650608661 is an apocalyptic number.

It is an amenable number.

1650608661 is a deficient number, since it is larger than the sum of its proper divisors (720942059).

1650608661 is a wasteful number, since it uses less digits than its factorization.

1650608661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25836.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1650608661 is about 40627.6834313747. The cubic root of 1650608661 is about 1181.8110323740.

The spelling of 1650608661 in words is "one billion, six hundred fifty million, six hundred eight thousand, six hundred sixty-one".