756291661 has 2 divisors, whose sum is σ = 756291662. Its totient is φ = 756291660.

The previous prime is 756291623. The next prime is 756291673. The reversal of 756291661 is 166192657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383415561 + 372876100 = 19581^2 + 19310^2 .

It is a cyclic number.

It is not a de Polignac number, because 756291661 - 2¹⁷ = 756160589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (756291061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 378145830 + 378145831.

It is an arithmetic number, because the mean of its divisors is an integer number (378145831).

Almost surely, 2^756291661 is an apocalyptic number.

It is an amenable number.

756291661 is a deficient number, since it is larger than the sum of its proper divisors (1).

756291661 is an equidigital number, since it uses as much as digits as its factorization.

756291661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 756291661 is about 27500.7574622955. The cubic root of 756291661 is about 911.0938265768.

The spelling of 756291661 in words is "seven hundred fifty-six million, two hundred ninety-one thousand, six hundred sixty-one".