681267326631 has 4 divisors (see below), whose sum is σ = 908356435512. Its totient is φ = 454178217752.

The previous prime is 681267326629. The next prime is 681267326651. The reversal of 681267326631 is 136623762186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681267326631 - 2¹ = 681267326629 is a prime.

It is a super-2 number, since 2×681267326631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681267326651) 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, 113544554436 + ... + 113544554441.

It is an arithmetic number, because the mean of its divisors is an integer number (227089108878).

Almost surely, 2^681267326631 is an apocalyptic number.

681267326631 is a deficient number, since it is larger than the sum of its proper divisors (227089108881).

681267326631 is a wasteful number, since it uses less digits than its factorization.

681267326631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227089108880.

The product of its digits is 2612736, while the sum is 51.

The spelling of 681267326631 in words is "six hundred eighty-one billion, two hundred sixty-seven million, three hundred twenty-six thousand, six hundred thirty-one".