705257315621 has 2 divisors, whose sum is σ = 705257315622. Its totient is φ = 705257315620.

The previous prime is 705257315611. The next prime is 705257315639. The reversal of 705257315621 is 126513752507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460207564996 + 245049750625 = 678386^2 + 495025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-705257315621 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 (705257315611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352628657810 + 352628657811.

It is an arithmetic number, because the mean of its divisors is an integer number (352628657811).

Almost surely, 2^705257315621 is an apocalyptic number.

It is an amenable number.

705257315621 is a deficient number, since it is larger than the sum of its proper divisors (1).

705257315621 is an equidigital number, since it uses as much as digits as its factorization.

705257315621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 441000, while the sum is 44.

The spelling of 705257315621 in words is "seven hundred five billion, two hundred fifty-seven million, three hundred fifteen thousand, six hundred twenty-one".