643126500652 has 12 divisors (see below), whose sum is σ = 1125498754800. Its totient is φ = 321555427856.

The previous prime is 643126500631. The next prime is 643126500683. The reversal of 643126500652 is 256005621346.

It is a happy number.

It is a super-2 number, since 2×643126500652² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768648 + ... + 2101039.

It is an arithmetic number, because the mean of its divisors is an integer number (93791562900).

Almost surely, 2^643126500652 is an apocalyptic number.

It is an amenable number.

643126500652 is a deficient number, since it is larger than the sum of its proper divisors (482372254148).

643126500652 is a wasteful number, since it uses less digits than its factorization.

643126500652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911240 (or 3911238 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 643126500652 in words is "six hundred forty-three billion, one hundred twenty-six million, five hundred thousand, six hundred fifty-two".