3645256132665 has 32 divisors (see below), whose sum is σ = 7406234684160. Its totient is φ = 1666402803072.

The previous prime is 3645256132631. The next prime is 3645256132667. The reversal of 3645256132665 is 5662316525463.

It is a happy number.

3645256132665 is a `hidden beast` number, since 3 + 6 + 4 + 5 + 256 + 1 + 326 + 65 = 666.

It is not a de Polignac number, because 3645256132665 - 2¹¹ = 3645256130617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3645256132667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1928706004 + ... + 1928707893.

It is an arithmetic number, because the mean of its divisors is an integer number (231444833880).

Almost surely, 2^{3645256132665} is an apocalyptic number.

3645256132665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3645256132665 is an abundant number, since it is smaller than the sum of its proper divisors (3760978551495).

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

3645256132665 is a wasteful number, since it uses less digits than its factorization.

3645256132665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857413918 (or 3857413912 counting only the distinct ones).

The product of its digits is 23328000, while the sum is 54.

The spelling of 3645256132665 in words is "three trillion, six hundred forty-five billion, two hundred fifty-six million, one hundred thirty-two thousand, six hundred sixty-five".