643620121401 has 8 divisors (see below), whose sum is σ = 863298846144. Its totient is φ = 426510738800.

The previous prime is 643620121399. The next prime is 643620121409. The reversal of 643620121401 is 104121026346.

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 643620121401 - 2¹ = 643620121399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643620121409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642334950 + ... + 642335951.

It is an arithmetic number, because the mean of its divisors is an integer number (107912355768).

Almost surely, 2^643620121401 is an apocalyptic number.

It is an amenable number.

643620121401 is a deficient number, since it is larger than the sum of its proper divisors (219678724743).

643620121401 is a wasteful number, since it uses less digits than its factorization.

643620121401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284671071.

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 643620121401 its reverse (104121026346), we get a palindrome (747741147747).

The spelling of 643620121401 in words is "six hundred forty-three billion, six hundred twenty million, one hundred twenty-one thousand, four hundred one".