56651661607 has 4 divisors (see below), whose sum is σ = 57427711840. Its totient is φ = 55875611376.

The previous prime is 56651661601. The next prime is 56651661631. The reversal of 56651661607 is 70616615665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70616615665 = 5 ⋅14123323133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56651661607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56651661601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388025007 + ... + 388025152.

It is an arithmetic number, because the mean of its divisors is an integer number (14356927960).

Almost surely, 2^56651661607 is an apocalyptic number.

56651661607 is a deficient number, since it is larger than the sum of its proper divisors (776050233).

56651661607 is an equidigital number, since it uses as much as digits as its factorization.

56651661607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776050232.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 56651661607 in words is "fifty-six billion, six hundred fifty-one million, six hundred sixty-one thousand, six hundred seven".