1643053722401 has 16 divisors (see below), whose sum is σ = 2022635666688. Its totient is φ = 1299731313600.

The previous prime is 1643053722397. The next prime is 1643053722421. The reversal of 1643053722401 is 1042273503461.

It is a cyclic number.

It is not a de Polignac number, because 1643053722401 - 2² = 1643053722397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1643053722421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1410110 + ... + 2296631.

It is an arithmetic number, because the mean of its divisors is an integer number (126414729168).

Almost surely, 2^{1643053722401} is an apocalyptic number.

It is an amenable number.

1643053722401 is a deficient number, since it is larger than the sum of its proper divisors (379581944287).

1643053722401 is a wasteful number, since it uses less digits than its factorization.

1643053722401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711632.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 1643053722401 in words is "one trillion, six hundred forty-three billion, fifty-three million, seven hundred twenty-two thousand, four hundred one".