66780463 has 2 divisors, whose sum is σ = 66780464. Its totient is φ = 66780462.

The previous prime is 66780457. The next prime is 66780481. The reversal of 66780463 is 36408766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66780463 - 2¹³ = 66772271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66780443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33390231 + 33390232.

It is an arithmetic number, because the mean of its divisors is an integer number (33390232).

Almost surely, 2^66780463 is an apocalyptic number.

66780463 is a deficient number, since it is larger than the sum of its proper divisors (1).

66780463 is an equidigital number, since it uses as much as digits as its factorization.

66780463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 66780463 is about 8171.9314118512. The cubic root of 66780463 is about 405.7107126543.

The spelling of 66780463 in words is "sixty-six million, seven hundred eighty thousand, four hundred sixty-three".