1643613615655 has 8 divisors (see below), whose sum is σ = 2151639642384. Its totient is φ = 1195355356800.

The previous prime is 1643613615601. The next prime is 1643613615659. The reversal of 1643613615655 is 5565163163461.

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

It is not a de Polignac number, because 1643613615655 - 2⁹ = 1643613615143 is a prime.

It is a super-2 number, since 2×1643613615655² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643613615659) by changing a digit.

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, 14941941906 + ... + 14941942015.

It is an arithmetic number, because the mean of its divisors is an integer number (268954955298).

Almost surely, 2^{1643613615655} is an apocalyptic number.

1643613615655 is a deficient number, since it is larger than the sum of its proper divisors (508026026729).

1643613615655 is a wasteful number, since it uses less digits than its factorization.

1643613615655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29883883937.

The product of its digits is 5832000, while the sum is 52.

The spelling of 1643613615655 in words is "one trillion, six hundred forty-three billion, six hundred thirteen million, six hundred fifteen thousand, six hundred fifty-five".