66763273541 has 4 divisors (see below), whose sum is σ = 66770667084. Its totient is φ = 66755880000.

The previous prime is 66763273537. The next prime is 66763273547. The reversal of 66763273541 is 14537236766.

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 65867169316 + 896104225 = 256646^2 + 29935^2 .

It is a cyclic number.

It is not a de Polignac number, because 66763273541 - 2² = 66763273537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66763273541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66763273547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3683210 + ... + 3701291.

It is an arithmetic number, because the mean of its divisors is an integer number (16692666771).

Almost surely, 2^66763273541 is an apocalyptic number.

It is an amenable number.

66763273541 is a deficient number, since it is larger than the sum of its proper divisors (7393543).

66763273541 is an equidigital number, since it uses as much as digits as its factorization.

66763273541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7393542.

The product of its digits is 3810240, while the sum is 50.

The spelling of 66763273541 in words is "sixty-six billion, seven hundred sixty-three million, two hundred seventy-three thousand, five hundred forty-one".