643154602452 has 24 divisors (see below), whose sum is σ = 1500819352032. Its totient is φ = 214366970400.

The previous prime is 643154602403. The next prime is 643154602457. The reversal of 643154602452 is 254206451346.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643154602457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2086999 + ... + 2375262.

It is an arithmetic number, because the mean of its divisors is an integer number (62534139668).

Almost surely, 2^643154602452 is an apocalyptic number.

It is an amenable number.

643154602452 is an abundant number, since it is smaller than the sum of its proper divisors (857664749580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643154602452 is a wasteful number, since it uses less digits than its factorization.

643154602452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474279 (or 4474277 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 643154602452 in words is "six hundred forty-three billion, one hundred fifty-four million, six hundred two thousand, four hundred fifty-two".