665147226551 has 2 divisors, whose sum is σ = 665147226552. Its totient is φ = 665147226550.

The previous prime is 665147226451. The next prime is 665147226629. The reversal of 665147226551 is 155622741566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665147226551 - 2¹⁰ = 665147225527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665147226551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665147226151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332573613275 + 332573613276.

It is an arithmetic number, because the mean of its divisors is an integer number (332573613276).

Almost surely, 2^665147226551 is an apocalyptic number.

665147226551 is a deficient number, since it is larger than the sum of its proper divisors (1).

665147226551 is an equidigital number, since it uses as much as digits as its factorization.

665147226551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024000, while the sum is 50.

The spelling of 665147226551 in words is "six hundred sixty-five billion, one hundred forty-seven million, two hundred twenty-six thousand, five hundred fifty-one".