66712677476477 has 2 divisors, whose sum is σ = 66712677476478. Its totient is φ = 66712677476476.

The previous prime is 66712677476399. The next prime is 66712677476483. The reversal of 66712677476477 is 77467477621766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35275450790596 + 31437226685881 = 5939314^2 + 5606891^2 .

It is a cyclic number.

It is not a de Polignac number, because 66712677476477 - 2¹⁰ = 66712677475453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66712677476398 and 66712677476407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66712677476177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33356338738238 + 33356338738239.

It is an arithmetic number, because the mean of its divisors is an integer number (33356338738239).

Almost surely, 2^{66712677476477} is an apocalyptic number.

It is an amenable number.

66712677476477 is a deficient number, since it is larger than the sum of its proper divisors (1).

66712677476477 is an equidigital number, since it uses as much as digits as its factorization.

66712677476477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4879139328, while the sum is 77.

The spelling of 66712677476477 in words is "sixty-six trillion, seven hundred twelve billion, six hundred seventy-seven million, four hundred seventy-six thousand, four hundred seventy-seven".