643126603425 has 48 divisors (see below), whose sum is σ = 1081539348480. Its totient is φ = 337147272000.

The previous prime is 643126603417. The next prime is 643126603439. The reversal of 643126603425 is 524306621346.

It is a happy number.

It is not a de Polignac number, because 643126603425 - 2³ = 643126603417 is a prime.

It is a super-2 number, since 2×643126603425² (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 47 ways as a sum of consecutive naturals, for example, 1580136 + ... + 1945014.

It is an arithmetic number, because the mean of its divisors is an integer number (22532069760).

Almost surely, 2^643126603425 is an apocalyptic number.

It is an amenable number.

643126603425 is a deficient number, since it is larger than the sum of its proper divisors (438412745055).

643126603425 is a wasteful number, since it uses less digits than its factorization.

643126603425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365294 (or 365289 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 643126603425 in words is "six hundred forty-three billion, one hundred twenty-six million, six hundred three thousand, four hundred twenty-five".