66146012461 has 4 divisors (see below), whose sum is σ = 66147167772. Its totient is φ = 66144857152.

The previous prime is 66146012431. The next prime is 66146012503. The reversal of 66146012461 is 16421064166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60568163236 + 5577849225 = 246106^2 + 74685^2 .

It is a cyclic number.

It is not a de Polignac number, because 66146012461 - 2¹³ = 66146004269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66146012461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66146012431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487036 + ... + 607861.

It is an arithmetic number, because the mean of its divisors is an integer number (16536791943).

Almost surely, 2^66146012461 is an apocalyptic number.

It is an amenable number.

66146012461 is a deficient number, since it is larger than the sum of its proper divisors (1155311).

66146012461 is a wasteful number, since it uses less digits than its factorization.

66146012461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155310.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 66146012461 in words is "sixty-six billion, one hundred forty-six million, twelve thousand, four hundred sixty-one".