1650216561 has 16 divisors (see below), whose sum is σ = 2565936000. Its totient is φ = 942980304.

The previous prime is 1650216511. The next prime is 1650216569. The reversal of 1650216561 is 1656120561.

It is not a de Polignac number, because 1650216561 - 2⁶ = 1650216497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1650216569) 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, 800826 + ... + 802883.

It is an arithmetic number, because the mean of its divisors is an integer number (160371000).

Almost surely, 2^1650216561 is an apocalyptic number.

It is an amenable number.

1650216561 is a deficient number, since it is larger than the sum of its proper divisors (915719439).

1650216561 is an equidigital number, since it uses as much as digits as its factorization.

1650216561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603733 (or 1603719 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1650216561 is about 40622.8576173563. The cubic root of 1650216561 is about 1181.7174457244.

The spelling of 1650216561 in words is "one billion, six hundred fifty million, two hundred sixteen thousand, five hundred sixty-one".