66769021313 has 16 divisors (see below), whose sum is σ = 71199810000. Its totient is φ = 62394488832.

The previous prime is 66769021301. The next prime is 66769021337. The reversal of 66769021313 is 31312096766.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2320059889 + 64448961424 = 48167^2 + 253868^2 .

It is a cyclic number.

It is not a de Polignac number, because 66769021313 - 2¹⁶ = 66768955777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66769021013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9948803 + ... + 9955511.

It is an arithmetic number, because the mean of its divisors is an integer number (4449988125).

Almost surely, 2^66769021313 is an apocalyptic number.

It is an amenable number.

66769021313 is a deficient number, since it is larger than the sum of its proper divisors (4430788687).

66769021313 is a wasteful number, since it uses less digits than its factorization.

66769021313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10804.

The product of its (nonzero) digits is 244944, while the sum is 44.

The spelling of 66769021313 in words is "sixty-six billion, seven hundred sixty-nine million, twenty-one thousand, three hundred thirteen".