66780151 has 2 divisors, whose sum is σ = 66780152. Its totient is φ = 66780150.

The previous prime is 66780149. The next prime is 66780209. The reversal of 66780151 is 15108766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66780151 - 2¹ = 66780149 is a prime.

Together with 66780149, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66780101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33390075 + 33390076.

It is an arithmetic number, because the mean of its divisors is an integer number (33390076).

Almost surely, 2^66780151 is an apocalyptic number.

66780151 is a deficient number, since it is larger than the sum of its proper divisors (1).

66780151 is an equidigital number, since it uses as much as digits as its factorization.

66780151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 66780151 is about 8171.9123220945. The cubic root of 66780151 is about 405.7100808231.

The spelling of 66780151 in words is "sixty-six million, seven hundred eighty thousand, one hundred fifty-one".