66831933215077 has 2 divisors, whose sum is σ = 66831933215078. Its totient is φ = 66831933215076.

The previous prime is 66831933214979. The next prime is 66831933215093. The reversal of 66831933215077 is 77051233913866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46519956866916 + 20311976348161 = 6820554^2 + 4506881^2 .

It is a cyclic number.

It is not a de Polignac number, because 66831933215077 - 2¹⁵ = 66831933182309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66831933215777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33415966607538 + 33415966607539.

It is an arithmetic number, because the mean of its divisors is an integer number (33415966607539).

Almost surely, 2^{66831933215077} is an apocalyptic number.

It is an amenable number.

66831933215077 is a deficient number, since it is larger than the sum of its proper divisors (1).

66831933215077 is an equidigital number, since it uses as much as digits as its factorization.

66831933215077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 66831933215077 in words is "sixty-six trillion, eight hundred thirty-one billion, nine hundred thirty-three million, two hundred fifteen thousand, seventy-seven".