665245820747 has 2 divisors, whose sum is σ = 665245820748. Its totient is φ = 665245820746.

The previous prime is 665245820713. The next prime is 665245820791. The reversal of 665245820747 is 747028542566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665245820747 - 2¹⁶ = 665245755211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665245820692 and 665245820701.

It is not a weakly prime, because it can be changed into another prime (665245820147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332622910373 + 332622910374.

It is an arithmetic number, because the mean of its divisors is an integer number (332622910374).

Almost surely, 2^665245820747 is an apocalyptic number.

665245820747 is a deficient number, since it is larger than the sum of its proper divisors (1).

665245820747 is an equidigital number, since it uses as much as digits as its factorization.

665245820747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22579200, while the sum is 56.

The spelling of 665245820747 in words is "six hundred sixty-five billion, two hundred forty-five million, eight hundred twenty thousand, seven hundred forty-seven".