643653153125401 has 8 divisors (see below), whose sum is σ = 666260890535880. Its totient is φ = 621072935788032.

The previous prime is 643653153125377. The next prime is 643653153125441. The reversal of 643653153125401 is 104521351356346.

It can be written as a sum of positive squares in 4 ways, for example, as 55277738010000 + 588375415115401 = 7434900^2 + 24256451^2 .

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 643653153125401 - 2⁷ = 643653153125273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643653153125441) 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, 6879970680 + ... + 6880064233.

It is an arithmetic number, because the mean of its divisors is an integer number (83282611316985).

Almost surely, 2^{643653153125401} is an apocalyptic number.

It is an amenable number.

643653153125401 is a deficient number, since it is larger than the sum of its proper divisors (22607737410479).

643653153125401 is a wasteful number, since it uses less digits than its factorization.

643653153125401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13760036555.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 643653153125401 in words is "six hundred forty-three trillion, six hundred fifty-three billion, one hundred fifty-three million, one hundred twenty-five thousand, four hundred one".