708127721681 has 4 divisors (see below), whose sum is σ = 708169548132. Its totient is φ = 708085895232.

The previous prime is 708127721657. The next prime is 708127721687. The reversal of 708127721681 is 186127721807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186127721807 = 20749 ⋅8970443.

It can be written as a sum of positive squares in 2 ways, for example, as 504929621056 + 203198100625 = 710584^2 + 450775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-708127721681 is a prime.

It is a super-2 number, since 2×708127721681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (708127721687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20887820 + ... + 20921693.

It is an arithmetic number, because the mean of its divisors is an integer number (177042387033).

Almost surely, 2^708127721681 is an apocalyptic number.

It is an amenable number.

708127721681 is a deficient number, since it is larger than the sum of its proper divisors (41826451).

708127721681 is a wasteful number, since it uses less digits than its factorization.

708127721681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41826450.

The product of its (nonzero) digits is 526848, while the sum is 50.

The spelling of 708127721681 in words is "seven hundred eight billion, one hundred twenty-seven million, seven hundred twenty-one thousand, six hundred eighty-one".