1225656165 has 16 divisors (see below), whose sum is σ = 1985875200. Its totient is φ = 645408192.

The previous prime is 1225656149. The next prime is 1225656181. The reversal of 1225656165 is 5616565221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1225656149) and next prime (1225656181).

It is not a de Polignac number, because 1225656165 - 2⁴ = 1225656149 is a prime.

It is a super-3 number, since 3×1225656165³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515970 + ... + 518339.

It is an arithmetic number, because the mean of its divisors is an integer number (124117200).

Almost surely, 2^1225656165 is an apocalyptic number.

1225656165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225656165 is a deficient number, since it is larger than the sum of its proper divisors (760219035).

1225656165 is a wasteful number, since it uses less digits than its factorization.

1225656165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034396.

The product of its digits is 108000, while the sum is 39.

The square root of 1225656165 is about 35009.3725307952. The cubic root of 1225656165 is about 1070.1784909095.

The spelling of 1225656165 in words is "one billion, two hundred twenty-five million, six hundred fifty-six thousand, one hundred sixty-five".