681005333545 has 4 divisors (see below), whose sum is σ = 817206400260. Its totient is φ = 544804266832.

The previous prime is 681005333537. The next prime is 681005333549. The reversal of 681005333545 is 545333500186.

It is a happy number.

681005333545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 191031933184 + 489973400361 = 437072^2 + 699981^2 .

It is a cyclic number.

It is not a de Polignac number, because 681005333545 - 2³ = 681005333537 is a prime.

It is a super-3 number, since 3×681005333545³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (681005333549) 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, 68100533350 + ... + 68100533359.

It is an arithmetic number, because the mean of its divisors is an integer number (204301600065).

Almost surely, 2^681005333545 is an apocalyptic number.

It is an amenable number.

681005333545 is a deficient number, since it is larger than the sum of its proper divisors (136201066715).

681005333545 is a wasteful number, since it uses less digits than its factorization.

681005333545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136201066714.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 681005333545 in words is "six hundred eighty-one billion, five million, three hundred thirty-three thousand, five hundred forty-five".