681257422372 has 24 divisors (see below), whose sum is σ = 1227606475032. Its totient is φ = 330598809600.

The previous prime is 681257422319. The next prime is 681257422399. The reversal of 681257422372 is 273224752186.

681257422372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 111887574016 + 569369848356 = 334496^2 + 754566^2 .

It is a super-2 number, since 2×681257422372² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10730029 + ... + 10793332.

It is an arithmetic number, because the mean of its divisors is an integer number (51150269793).

Almost surely, 2^681257422372 is an apocalyptic number.

It is an amenable number.

681257422372 is a deficient number, since it is larger than the sum of its proper divisors (546349052660).

681257422372 is a wasteful number, since it uses less digits than its factorization.

681257422372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21523599 (or 21523597 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 49.

The spelling of 681257422372 in words is "six hundred eighty-one billion, two hundred fifty-seven million, four hundred twenty-two thousand, three hundred seventy-two".