66520351 has 2 divisors, whose sum is σ = 66520352. Its totient is φ = 66520350.

The previous prime is 66520331. The next prime is 66520367. The reversal of 66520351 is 15302566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66520351 - 2⁵ = 66520319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66520331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33260175 + 33260176.

It is an arithmetic number, because the mean of its divisors is an integer number (33260176).

Almost surely, 2^66520351 is an apocalyptic number.

66520351 is a deficient number, since it is larger than the sum of its proper divisors (1).

66520351 is an equidigital number, since it uses as much as digits as its factorization.

66520351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66520351 is about 8156.0009195684. Note that the first 3 decimals coincide. The cubic root of 66520351 is about 405.1832752776.

The spelling of 66520351 in words is "sixty-six million, five hundred twenty thousand, three hundred fifty-one".