56691819667 has 4 divisors (see below), whose sum is σ = 64790651056. Its totient is φ = 48592988280.

The previous prime is 56691819659. The next prime is 56691819683. The reversal of 56691819667 is 76691819665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76691819665 = 5 ⋅15338363933.

It is a cyclic number.

It is not a de Polignac number, because 56691819667 - 2³ = 56691819659 is a prime.

It is a super-3 number, since 3×56691819667³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56691819599 and 56691819608.

It is not an unprimeable number, because it can be changed into a prime (56691819167) 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, 4049415684 + ... + 4049415697.

It is an arithmetic number, because the mean of its divisors is an integer number (16197662764).

Almost surely, 2^56691819667 is an apocalyptic number.

56691819667 is a deficient number, since it is larger than the sum of its proper divisors (8098831389).

56691819667 is an equidigital number, since it uses as much as digits as its factorization.

56691819667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8098831388.

The product of its digits is 29393280, while the sum is 64.

The spelling of 56691819667 in words is "fifty-six billion, six hundred ninety-one million, eight hundred nineteen thousand, six hundred sixty-seven".