681266735 has 16 divisors (see below), whose sum is σ = 826023936. Its totient is φ = 539366688.

The previous prime is 681266713. The next prime is 681266737. The reversal of 681266735 is 537662186.

It is a cyclic number.

It is not a de Polignac number, because 681266735 - 2⁸ = 681266479 is a prime.

It is a super-3 number, since 3×681266735³ (a number of 27 digits) contains 333 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 (681266737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308144 + ... + 310346.

It is an arithmetic number, because the mean of its divisors is an integer number (51626496).

Almost surely, 2^681266735 is an apocalyptic number.

681266735 is a deficient number, since it is larger than the sum of its proper divisors (144757201).

681266735 is a wasteful number, since it uses less digits than its factorization.

681266735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822.

The product of its digits is 362880, while the sum is 44.

The square root of 681266735 is about 26101.0868547653. The cubic root of 681266735 is about 879.9116367026.

The spelling of 681266735 in words is "six hundred eighty-one million, two hundred sixty-six thousand, seven hundred thirty-five".