1216101650 has 24 divisors (see below), whose sum is σ = 2381000880. Its totient is φ = 460838160.

The previous prime is 1216101617. The next prime is 1216101659. The reversal of 1216101650 is 561016121.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1216101659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 639104 + ... + 641003.

It is an arithmetic number, because the mean of its divisors is an integer number (99208370).

Almost surely, 2^1216101650 is an apocalyptic number.

1216101650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216101650 is a deficient number, since it is larger than the sum of its proper divisors (1164899230).

1216101650 is a wasteful number, since it uses less digits than its factorization.

1216101650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280138 (or 1280133 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1216101650 is about 34872.6490247013. The cubic root of 1216101650 is about 1067.3904002201.

Adding to 1216101650 its reverse (561016121), we get a palindrome (1777117771).

The spelling of 1216101650 in words is "one billion, two hundred sixteen million, one hundred one thousand, six hundred fifty".