715906661 has 2 divisors, whose sum is σ = 715906662. Its totient is φ = 715906660.

The previous prime is 715906651. The next prime is 715906663. The reversal of 715906661 is 166609517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 475501636 + 240405025 = 21806^2 + 15505^2 .

It is an emirp because it is prime and its reverse (166609517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 715906661 - 2²⁶ = 648797797 is a prime.

Together with 715906663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715906663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357953330 + 357953331.

It is an arithmetic number, because the mean of its divisors is an integer number (357953331).

Almost surely, 2^715906661 is an apocalyptic number.

It is an amenable number.

715906661 is a deficient number, since it is larger than the sum of its proper divisors (1).

715906661 is an equidigital number, since it uses as much as digits as its factorization.

715906661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 715906661 is about 26756.4321425709. The cubic root of 715906661 is about 894.5792102442.

The spelling of 715906661 in words is "seven hundred fifteen million, nine hundred six thousand, six hundred sixty-one".