643457754346 has 128 divisors (see below), whose sum is σ = 1215755329536. Its totient is φ = 251705287680.

The previous prime is 643457754341. The next prime is 643457754371.

It is a happy number.

643457754346 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (643457754341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17366136 + ... + 17403148.

It is an arithmetic number, because the mean of its divisors is an integer number (9498088512).

Almost surely, 2^643457754346 is an apocalyptic number.

643457754346 is a deficient number, since it is larger than the sum of its proper divisors (572297575190).

643457754346 is a wasteful number, since it uses less digits than its factorization.

643457754346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37156.

The product of its digits is 101606400, while the sum is 58.

The spelling of 643457754346 in words is "six hundred forty-three billion, four hundred fifty-seven million, seven hundred fifty-four thousand, three hundred forty-six".