1644016371465 has 16 divisors (see below), whose sum is σ = 2832766671168. Its totient is φ = 809361905856.

The previous prime is 1644016371463. The next prime is 1644016371469. The reversal of 1644016371465 is 5641736104461.

It is not a de Polignac number, because 1644016371465 - 2¹ = 1644016371463 is a prime.

It is a super-3 number, since 3×1644016371465³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644016371463) 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 15 ways as a sum of consecutive naturals, for example, 4215426399 + ... + 4215426788.

It is an arithmetic number, because the mean of its divisors is an integer number (177047916948).

Almost surely, 2^{1644016371465} is an apocalyptic number.

1644016371465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1644016371465 is a deficient number, since it is larger than the sum of its proper divisors (1188750299703).

1644016371465 is a wasteful number, since it uses less digits than its factorization.

1644016371465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8430853208.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 1644016371465 in words is "one trillion, six hundred forty-four billion, sixteen million, three hundred seventy-one thousand, four hundred sixty-five".