665470028191 has 2 divisors, whose sum is σ = 665470028192. Its totient is φ = 665470028190.

The previous prime is 665470028123. The next prime is 665470028219. The reversal of 665470028191 is 191820074566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665470028191 - 2⁹ = 665470027679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665470028791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332735014095 + 332735014096.

It is an arithmetic number, because the mean of its divisors is an integer number (332735014096).

Almost surely, 2^665470028191 is an apocalyptic number.

665470028191 is a deficient number, since it is larger than the sum of its proper divisors (1).

665470028191 is an equidigital number, since it uses as much as digits as its factorization.

665470028191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 665470028191 in words is "six hundred sixty-five billion, four hundred seventy million, twenty-eight thousand, one hundred ninety-one".