66212243461 has 64 divisors (see below), whose sum is σ = 89087040000. Its totient is φ = 47731203072.

The previous prime is 66212243411. The next prime is 66212243473. The reversal of 66212243461 is 16434221266.

It is not a de Polignac number, because 66212243461 - 2¹⁵ = 66212210693 is a prime.

It is a super-2 number, since 2×66212243461² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66212243461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66212243401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13485475 + ... + 13490383.

It is an arithmetic number, because the mean of its divisors is an integer number (1391985000).

Almost surely, 2^66212243461 is an apocalyptic number.

It is an amenable number.

66212243461 is a deficient number, since it is larger than the sum of its proper divisors (22874796539).

66212243461 is a wasteful number, since it uses less digits than its factorization.

66212243461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246.

The product of its digits is 82944, while the sum is 37.

The spelling of 66212243461 in words is "sixty-six billion, two hundred twelve million, two hundred forty-three thousand, four hundred sixty-one".