643603972629 has 8 divisors (see below), whose sum is σ = 879068840832. Its totient is φ = 418604209760.

The previous prime is 643603972607. The next prime is 643603972657. The reversal of 643603972629 is 926279306346.

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 643603972629 - 2¹⁵ = 643603939861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643603972829) 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, 2616276189 + ... + 2616276434.

It is an arithmetic number, because the mean of its divisors is an integer number (109883605104).

Almost surely, 2^643603972629 is an apocalyptic number.

It is an amenable number.

643603972629 is a deficient number, since it is larger than the sum of its proper divisors (235464868203).

643603972629 is a wasteful number, since it uses less digits than its factorization.

643603972629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232552667.

The product of its (nonzero) digits is 17635968, while the sum is 57.

The spelling of 643603972629 in words is "six hundred forty-three billion, six hundred three million, nine hundred seventy-two thousand, six hundred twenty-nine".