666761453 has 2 divisors, whose sum is σ = 666761454. Its totient is φ = 666761452.

The previous prime is 666761449. The next prime is 666761531. The reversal of 666761453 is 354167666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371024644 + 295736809 = 19262^2 + 17197^2 .

It is a cyclic number.

It is not a de Polignac number, because 666761453 - 2² = 666761449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666761653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333380726 + 333380727.

It is an arithmetic number, because the mean of its divisors is an integer number (333380727).

Almost surely, 2^666761453 is an apocalyptic number.

It is an amenable number.

666761453 is a deficient number, since it is larger than the sum of its proper divisors (1).

666761453 is an equidigital number, since it uses as much as digits as its factorization.

666761453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 44.

The square root of 666761453 is about 25821.7244389293. The cubic root of 666761453 is about 873.6218645189.

The spelling of 666761453 in words is "six hundred sixty-six million, seven hundred sixty-one thousand, four hundred fifty-three".