1684631645465 has 8 divisors (see below), whose sum is σ = 2140473149640. Its totient is φ = 1268428532992.

The previous prime is 1684631645449. The next prime is 1684631645471. The reversal of 1684631645465 is 5645461364861.

It can be written as a sum of positive squares in 4 ways, for example, as 751375178761 + 933256466704 = 866819^2 + 966052^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1684631645465 - 2⁴ = 1684631645449 is a prime.

It is a super-2 number, since 2×1684631645465² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9909597830 + ... + 9909597999.

It is an arithmetic number, because the mean of its divisors is an integer number (267559143705).

Almost surely, 2^{1684631645465} is an apocalyptic number.

It is an amenable number.

1684631645465 is a deficient number, since it is larger than the sum of its proper divisors (455841504175).

1684631645465 is a wasteful number, since it uses less digits than its factorization.

1684631645465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19819195851.

The product of its digits is 49766400, while the sum is 59.

The spelling of 1684631645465 in words is "one trillion, six hundred eighty-four billion, six hundred thirty-one million, six hundred forty-five thousand, four hundred sixty-five".