681266159 has 6 divisors (see below), whose sum is σ = 792493344. Its totient is φ = 583942380.

The previous prime is 681266153. The next prime is 681266171. The reversal of 681266159 is 951662186.

It is a de Polignac number, because none of the positive numbers 2^k-681266159 is a prime.

It is a super-2 number, since 2×681266159² = 928247158797226562, which 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 (681266153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6951647 + ... + 6951744.

It is an arithmetic number, because the mean of its divisors is an integer number (132082224).

Almost surely, 2^681266159 is an apocalyptic number.

681266159 is a deficient number, since it is larger than the sum of its proper divisors (111227185).

681266159 is a wasteful number, since it uses less digits than its factorization.

681266159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13903405 (or 13903398 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 681266159 is about 26101.0758207397. The cubic root of 681266159 is about 879.9113887188.

The spelling of 681266159 in words is "six hundred eighty-one million, two hundred sixty-six thousand, one hundred fifty-nine".