1225236021165 has 256 divisors, whose sum is σ = 2474657740800. Its totient is φ = 574060151808.

The previous prime is 1225236021089. The next prime is 1225236021173. The reversal of 1225236021165 is 5611206325221.

1225236021165 is a `hidden beast` number, since 1 + 2 + 2 + 523 + 60 + 2 + 11 + 65 = 666.

It is not a de Polignac number, because 1225236021165 - 2⁸ = 1225236020909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1998753399 + ... + 1998754011.

It is an arithmetic number, because the mean of its divisors is an integer number (9666631800).

Almost surely, 2^{1225236021165} is an apocalyptic number.

1225236021165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225236021165 is an abundant number, since it is smaller than the sum of its proper divisors (1249421719635).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225236021165 is a wasteful number, since it uses less digits than its factorization.

1225236021165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 950 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 1225236021165 in words is "one trillion, two hundred twenty-five billion, two hundred thirty-six million, twenty-one thousand, one hundred sixty-five".