216666050601 has 64 divisors (see below), whose sum is σ = 388051163136. Its totient is φ = 103849344000.

The previous prime is 216666050597. The next prime is 216666050647. The reversal of 216666050601 is 106050666612.

It is not a de Polignac number, because 216666050601 - 2² = 216666050597 is a prime.

It is a super-2 number, since 2×216666050601² (a number of 23 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 216666050601.

It is not an unprimeable number, because it can be changed into a prime (216666050681) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7243326 + ... + 7273176.

It is an arithmetic number, because the mean of its divisors is an integer number (6063299424).

Almost surely, 2^216666050601 is an apocalyptic number.

216666050601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

216666050601 is a deficient number, since it is larger than the sum of its proper divisors (171385112535).

216666050601 is a wasteful number, since it uses less digits than its factorization.

216666050601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32302.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 216666050601 in words is "two hundred sixteen billion, six hundred sixty-six million, fifty thousand, six hundred one".