1643951630223 has 48 divisors (see below), whose sum is σ = 2816049240576. Its totient is φ = 904630991040.

The previous prime is 1643951630203. The next prime is 1643951630231. The reversal of 1643951630223 is 3220361593461.

1643951630223 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 9 + 5 + 1 + 630 + 2 + 2 + 3 = 666.

It is not a de Polignac number, because 1643951630223 - 2¹⁸ = 1643951368079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643951630203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4081240 + ... + 4465917.

It is an arithmetic number, because the mean of its divisors is an integer number (58667692512).

Almost surely, 2^{1643951630223} is an apocalyptic number.

1643951630223 is a deficient number, since it is larger than the sum of its proper divisors (1172097610353).

1643951630223 is a wasteful number, since it uses less digits than its factorization.

1643951630223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8547284 (or 8547281 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 1643951630223 in words is "one trillion, six hundred forty-three billion, nine hundred fifty-one million, six hundred thirty thousand, two hundred twenty-three".