665434627787 has 2 divisors, whose sum is σ = 665434627788. Its totient is φ = 665434627786.

The previous prime is 665434627723. The next prime is 665434627799. The reversal of 665434627787 is 787726434566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665434627787 - 2⁶ = 665434627723 is a prime.

It is not a weakly prime, because it can be changed into another prime (665434627687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332717313893 + 332717313894.

It is an arithmetic number, because the mean of its divisors is an integer number (332717313894).

Almost surely, 2^665434627787 is an apocalyptic number.

665434627787 is a deficient number, since it is larger than the sum of its proper divisors (1).

665434627787 is an equidigital number, since it uses as much as digits as its factorization.

665434627787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 284497920, while the sum is 65.

The spelling of 665434627787 in words is "six hundred sixty-five billion, four hundred thirty-four million, six hundred twenty-seven thousand, seven hundred eighty-seven".