681578874461 has 16 divisors (see below), whose sum is σ = 742613443200. Its totient is φ = 623581240128.

The previous prime is 681578874451. The next prime is 681578874469. The reversal of 681578874461 is 164478875186.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681578874461 is a prime.

It is a super-2 number, since 2×681578874461² (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 (681578874469) 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 15 ways as a sum of consecutive naturals, for example, 4703666 + ... + 4846403.

It is an arithmetic number, because the mean of its divisors is an integer number (46413340200).

Almost surely, 2^681578874461 is an apocalyptic number.

It is an amenable number.

681578874461 is a deficient number, since it is larger than the sum of its proper divisors (61034568739).

681578874461 is a wasteful number, since it uses less digits than its factorization.

681578874461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9550228.

The product of its digits is 72253440, while the sum is 65.

The spelling of 681578874461 in words is "six hundred eighty-one billion, five hundred seventy-eight million, eight hundred seventy-four thousand, four hundred sixty-one".