643611531356616 has 32 divisors (see below), whose sum is σ = 1610412344220960. Its totient is φ = 214352708341632.

The previous prime is 643611531356581. The next prime is 643611531356657. The reversal of 643611531356616 is 616653135116346.

It is a super-3 number, since 3×643611531356616³ (a number of 45 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11529270085 + ... + 11529325908.

It is an arithmetic number, because the mean of its divisors is an integer number (50325385756905).

Almost surely, 2^{643611531356616} is an apocalyptic number.

It is an amenable number.

643611531356616 is an abundant number, since it is smaller than the sum of its proper divisors (966800812864344).

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

643611531356616 is a wasteful number, since it uses less digits than its factorization.

643611531356616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23058597165 (or 23058597161 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 57.

The spelling of 643611531356616 in words is "six hundred forty-three trillion, six hundred eleven billion, five hundred thirty-one million, three hundred fifty-six thousand, six hundred sixteen".