705720635021 has 2 divisors, whose sum is σ = 705720635022. Its totient is φ = 705720635020.

The previous prime is 705720634921. The next prime is 705720635041. The reversal of 705720635021 is 120536027507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 606196159396 + 99524475625 = 778586^2 + 315475^2 .

It is a cyclic number.

It is not a de Polignac number, because 705720635021 - 2¹⁴ = 705720618637 is a prime.

It is a super-2 number, since 2×705720635021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705720635041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352860317510 + 352860317511.

It is an arithmetic number, because the mean of its divisors is an integer number (352860317511).

Almost surely, 2^705720635021 is an apocalyptic number.

It is an amenable number.

705720635021 is a deficient number, since it is larger than the sum of its proper divisors (1).

705720635021 is an equidigital number, since it uses as much as digits as its factorization.

705720635021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 705720635021 in words is "seven hundred five billion, seven hundred twenty million, six hundred thirty-five thousand, twenty-one".