1216662601 has 24 divisors (see below), whose sum is σ = 1585719936. Its totient is φ = 922410720.

The previous prime is 1216662589. The next prime is 1216662617. The reversal of 1216662601 is 1062666121.

It is not a de Polignac number, because 1216662601 - 2⁹ = 1216662089 is a prime.

It is a Duffinian number.

1216662601 is a modest number, since divided by 62601 gives 12166 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1216662101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10561 + ... + 50446.

It is an arithmetic number, because the mean of its divisors is an integer number (66071664).

Almost surely, 2^1216662601 is an apocalyptic number.

1216662601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1216662601 is a deficient number, since it is larger than the sum of its proper divisors (369057335).

1216662601 is a wasteful number, since it uses less digits than its factorization.

1216662601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61069 (or 61062 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1216662601 is about 34880.6909478582. The cubic root of 1216662601 is about 1067.5544933214.

The spelling of 1216662601 in words is "one billion, two hundred sixteen million, six hundred sixty-two thousand, six hundred one".