758400661 has 2 divisors, whose sum is σ = 758400662. Its totient is φ = 758400660.

The previous prime is 758400653. The next prime is 758400667. The reversal of 758400661 is 166004857.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755920036 + 2480625 = 27494^2 + 1575^2 .

It is an emirp because it is prime and its reverse (166004857) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 758400661 - 2³ = 758400653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 758400661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (758400667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 379200330 + 379200331.

It is an arithmetic number, because the mean of its divisors is an integer number (379200331).

Almost surely, 2^758400661 is an apocalyptic number.

It is an amenable number.

758400661 is a deficient number, since it is larger than the sum of its proper divisors (1).

758400661 is an equidigital number, since it uses as much as digits as its factorization.

758400661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 758400661 is about 27539.0751660255. The cubic root of 758400661 is about 911.9399346951.

The spelling of 758400661 in words is "seven hundred fifty-eight million, four hundred thousand, six hundred sixty-one".