643620125666042 has 32 divisors (see below), whose sum is σ = 1118451939760512. Its totient is φ = 272072181072384.

The previous prime is 643620125666027. The next prime is 643620125666059. The reversal of 643620125666042 is 240666521026346.

It is a super-2 number, since 2×643620125666042² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448140383 + ... + 449574290.

It is an arithmetic number, because the mean of its divisors is an integer number (34951623117516).

Almost surely, 2^{643620125666042} is an apocalyptic number.

643620125666042 is a deficient number, since it is larger than the sum of its proper divisors (474831814094470).

643620125666042 is a wasteful number, since it uses less digits than its factorization.

643620125666042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897715382.

The product of its (nonzero) digits is 14929920, while the sum is 53.

The spelling of 643620125666042 in words is "six hundred forty-three trillion, six hundred twenty billion, one hundred twenty-five million, six hundred sixty-six thousand, forty-two".