66762051651161 has 4 divisors (see below), whose sum is σ = 69064191363300. Its totient is φ = 64459911939024.

The previous prime is 66762051651137. The next prime is 66762051651199. The reversal of 66762051651161 is 16115615026766.

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 27198895145536 + 39563156505625 = 5215256^2 + 6289925^2 .

It is a cyclic number.

It is not a de Polignac number, because 66762051651161 - 2¹⁴ = 66762051634777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66762051651461) 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, 1151069856026 + ... + 1151069856083.

It is an arithmetic number, because the mean of its divisors is an integer number (17266047840825).

Almost surely, 2^{66762051651161} is an apocalyptic number.

It is an amenable number.

66762051651161 is a deficient number, since it is larger than the sum of its proper divisors (2302139712139).

66762051651161 is a wasteful number, since it uses less digits than its factorization.

66762051651161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302139712138.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 66762051651161 in words is "sixty-six trillion, seven hundred sixty-two billion, fifty-one million, six hundred fifty-one thousand, one hundred sixty-one".