662706391 has 2 divisors, whose sum is σ = 662706392. Its totient is φ = 662706390.

The previous prime is 662706367. The next prime is 662706413. The reversal of 662706391 is 193607266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 662706391 - 2¹⁵ = 662673623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662706311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331353195 + 331353196.

It is an arithmetic number, because the mean of its divisors is an integer number (331353196).

Almost surely, 2^662706391 is an apocalyptic number.

662706391 is a deficient number, since it is larger than the sum of its proper divisors (1).

662706391 is an equidigital number, since it uses as much as digits as its factorization.

662706391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 662706391 is about 25743.0843334671. The cubic root of 662706391 is about 871.8472183968.

The spelling of 662706391 in words is "six hundred sixty-two million, seven hundred six thousand, three hundred ninety-one".