706322857781 has 4 divisors (see below), whose sum is σ = 707678564364. Its totient is φ = 704967151200.

The previous prime is 706322857771. The next prime is 706322857789. The reversal of 706322857781 is 187758223607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187758223607 = 59 ⋅3182342773.

It can be written as a sum of positive squares in 2 ways, for example, as 58450798756 + 647872059025 = 241766^2 + 804905^2 .

It is a cyclic number.

It is not a de Polignac number, because 706322857781 - 2¹⁸ = 706322595637 is a prime.

It is a super-2 number, since 2×706322857781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706322857789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677852510 + ... + 677853551.

It is an arithmetic number, because the mean of its divisors is an integer number (176919641091).

Almost surely, 2^706322857781 is an apocalyptic number.

It is an amenable number.

706322857781 is a deficient number, since it is larger than the sum of its proper divisors (1355706583).

706322857781 is a wasteful number, since it uses less digits than its factorization.

706322857781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355706582.

The product of its (nonzero) digits is 7902720, while the sum is 56.

The spelling of 706322857781 in words is "seven hundred six billion, three hundred twenty-two million, eight hundred fifty-seven thousand, seven hundred eighty-one".