660762457 has 2 divisors, whose sum is σ = 660762458. Its totient is φ = 660762456.

The previous prime is 660762451. The next prime is 660762463. The reversal of 660762457 is 754267066.

It is a balanced prime because it is at equal distance from previous prime (660762451) and next prime (660762463).

It can be written as a sum of positive squares in only one way, i.e., 474194176 + 186568281 = 21776^2 + 13659^2 .

It is a cyclic number.

It is not a de Polignac number, because 660762457 - 2⁷ = 660762329 is a prime.

It is not a weakly prime, because it can be changed into another prime (660762451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330381228 + 330381229.

It is an arithmetic number, because the mean of its divisors is an integer number (330381229).

Almost surely, 2^660762457 is an apocalyptic number.

It is an amenable number.

660762457 is a deficient number, since it is larger than the sum of its proper divisors (1).

660762457 is an equidigital number, since it uses as much as digits as its factorization.

660762457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 43.

The square root of 660762457 is about 25705.3001733106. The cubic root of 660762457 is about 870.9939127568.

The spelling of 660762457 in words is "six hundred sixty million, seven hundred sixty-two thousand, four hundred fifty-seven".