66351115477 has 2 divisors, whose sum is σ = 66351115478. Its totient is φ = 66351115476.

The previous prime is 66351115429. The next prime is 66351115483. The reversal of 66351115477 is 77451115366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64105682481 + 2245432996 = 253191^2 + 47386^2 .

It is a cyclic number.

It is not a de Polignac number, because 66351115477 - 2¹⁹ = 66350591189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66351110477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33175557738 + 33175557739.

It is an arithmetic number, because the mean of its divisors is an integer number (33175557739).

Almost surely, 2^66351115477 is an apocalyptic number.

It is an amenable number.

66351115477 is a deficient number, since it is larger than the sum of its proper divisors (1).

66351115477 is an equidigital number, since it uses as much as digits as its factorization.

66351115477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 46.

The spelling of 66351115477 in words is "sixty-six billion, three hundred fifty-one million, one hundred fifteen thousand, four hundred seventy-seven".