643155144426 has 96 divisors (see below), whose sum is σ = 1438153928640. Its totient is φ = 207605244672.

The previous prime is 643155144413. The next prime is 643155144493. The reversal of 643155144426 is 624441551346.

643155144426 is a `hidden beast` number, since 6 + 4 + 31 + 55 + 144 + 426 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93628120 + ... + 93634988.

It is an arithmetic number, because the mean of its divisors is an integer number (14980770090).

Almost surely, 2^643155144426 is an apocalyptic number.

643155144426 is an abundant number, since it is smaller than the sum of its proper divisors (794998784214).

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

643155144426 is a wasteful number, since it uses less digits than its factorization.

643155144426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7940 (or 7937 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 45.

The spelling of 643155144426 in words is "six hundred forty-three billion, one hundred fifty-five million, one hundred forty-four thousand, four hundred twenty-six".