665147226428 has 12 divisors (see below), whose sum is σ = 1172504053392. Its totient is φ = 330146068320.

The previous prime is 665147226427. The next prime is 665147226431. The reversal of 665147226428 is 824622741566.

It is a happy number.

It is a super-2 number, since 2×665147226428² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665147226428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665147226427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606885608 + ... + 606886703.

It is an arithmetic number, because the mean of its divisors is an integer number (97708671116).

Almost surely, 2^665147226428 is an apocalyptic number.

It is an amenable number.

665147226428 is a deficient number, since it is larger than the sum of its proper divisors (507356826964).

665147226428 is a wasteful number, since it uses less digits than its factorization.

665147226428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213772452 (or 1213772450 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 53.

The spelling of 665147226428 in words is "six hundred sixty-five billion, one hundred forty-seven million, two hundred twenty-six thousand, four hundred twenty-eight".