643375757674 has 24 divisors (see below), whose sum is σ = 1045093632012. Its totient is φ = 296918818560.

The previous prime is 643375757671. The next prime is 643375757701. The reversal of 643375757674 is 476757573346.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 481992782049 + 161382975625 = 694257^2 + 401725^2 .

It is not an unprimeable number, because it can be changed into a prime (643375757671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4554612 + ... + 4693744.

Almost surely, 2^643375757674 is an apocalyptic number.

643375757674 is a deficient number, since it is larger than the sum of its proper divisors (401717874338).

643375757674 is a wasteful number, since it uses less digits than its factorization.

643375757674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152842 (or 152829 counting only the distinct ones).

The product of its digits is 311169600, while the sum is 64.

The spelling of 643375757674 in words is "six hundred forty-three billion, three hundred seventy-five million, seven hundred fifty-seven thousand, six hundred seventy-four".