1644360245 has 16 divisors (see below), whose sum is σ = 2193236352. Its totient is φ = 1173332160.

The previous prime is 1644360197. The next prime is 1644360257. The reversal of 1644360245 is 5420634461.

It is a de Polignac number, because none of the positive numbers 2^k-1644360245 is a prime.

It is a super-3 number, since 3×1644360245³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

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, 279137 + ... + 284966.

It is an arithmetic number, because the mean of its divisors is an integer number (137077272).

Almost surely, 2^1644360245 is an apocalyptic number.

It is an amenable number.

1644360245 is a deficient number, since it is larger than the sum of its proper divisors (548876107).

1644360245 is a wasteful number, since it uses less digits than its factorization.

1644360245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564172.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1644360245 is about 40550.7120159437. The cubic root of 1644360245 is about 1180.3178893130.

The spelling of 1644360245 in words is "one billion, six hundred forty-four million, three hundred sixty thousand, two hundred forty-five".