681963866067 has 32 divisors (see below), whose sum is σ = 1000890630144. Its totient is φ = 409592484000.

The previous prime is 681963866063. The next prime is 681963866069. The reversal of 681963866067 is 760668369186.

It is not a de Polignac number, because 681963866067 - 2² = 681963866063 is a prime.

It is a super-2 number, since 2×681963866067² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681963865989 and 681963866007.

It is not an unprimeable number, because it can be changed into a prime (681963866063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3625692 + ... + 3809142.

It is an arithmetic number, because the mean of its divisors is an integer number (31277832192).

Almost surely, 2^681963866067 is an apocalyptic number.

681963866067 is a deficient number, since it is larger than the sum of its proper divisors (318926764077).

681963866067 is a wasteful number, since it uses less digits than its factorization.

681963866067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184479.

The product of its (nonzero) digits is 94058496, while the sum is 66.

The spelling of 681963866067 in words is "six hundred eighty-one billion, nine hundred sixty-three million, eight hundred sixty-six thousand, sixty-seven".