643259972097 has 36 divisors (see below), whose sum is σ = 978430954176. Its totient is φ = 422799675480.

The previous prime is 643259972093. The next prime is 643259972101. The reversal of 643259972097 is 790279952346.

643259972097 is a `hidden beast` number, since 6 + 4 + 32 + 599 + 7 + 2 + 0 + 9 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (643259972093) and next prime (643259972101).

It is not a de Polignac number, because 643259972097 - 2² = 643259972093 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643259972093) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 224613 + ... + 1156274.

It is an arithmetic number, because the mean of its divisors is an integer number (27178637616).

Almost surely, 2^643259972097 is an apocalyptic number.

It is an amenable number.

643259972097 is a deficient number, since it is larger than the sum of its proper divisors (335170982079).

643259972097 is an frugal number, since it uses more digits than its factorization.

643259972097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380982 (or 1380961 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 63.

The spelling of 643259972097 in words is "six hundred forty-three billion, two hundred fifty-nine million, nine hundred seventy-two thousand, ninety-seven".