681077905439 has 4 divisors (see below), whose sum is σ = 681080114520. Its totient is φ = 681075696360.

The previous prime is 681077905423. The next prime is 681077905441. The reversal of 681077905439 is 934509770186.

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 681077905439 - 2⁴ = 681077905423 is a prime.

It is a super-2 number, since 2×681077905439² (a number of 24 digits) 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 (681077905489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548909 + ... + 1289750.

It is an arithmetic number, because the mean of its divisors is an integer number (170270028630).

Almost surely, 2^681077905439 is an apocalyptic number.

681077905439 is a deficient number, since it is larger than the sum of its proper divisors (2209081).

681077905439 is a wasteful number, since it uses less digits than its factorization.

681077905439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209080.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 681077905439 in words is "six hundred eighty-one billion, seventy-seven million, nine hundred five thousand, four hundred thirty-nine".