681957565 has 8 divisors (see below), whose sum is σ = 820581120. Its totient is φ = 544078032.

The previous prime is 681957547. The next prime is 681957571. The reversal of 681957565 is 565759186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681957565 - 2⁹ = 681957053 is a prime.

It is a super-2 number, since 2×681957565² = 930132240921458450, which contains 22 as substring.

It is a congruent number.

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, 183985 + ... + 187654.

It is an arithmetic number, because the mean of its divisors is an integer number (102572640).

Almost surely, 2^681957565 is an apocalyptic number.

It is an amenable number.

681957565 is a deficient number, since it is larger than the sum of its proper divisors (138623555).

681957565 is a wasteful number, since it uses less digits than its factorization.

681957565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372011.

The product of its digits is 2268000, while the sum is 52.

The square root of 681957565 is about 26114.3172416971. The cubic root of 681957565 is about 880.2089573520.

The spelling of 681957565 in words is "six hundred eighty-one million, nine hundred fifty-seven thousand, five hundred sixty-five".