616645136660540 has 96 divisors (see below), whose sum is σ = 1467983357568000. Its totient is φ = 215698264733952.

The previous prime is 616645136660491. The next prime is 616645136660591. The reversal of 616645136660540 is 45066631546616.

It is a self number, because there is not a number n which added to its sum of digits gives 616645136660540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 415399751 + ... + 416881569.

It is an arithmetic number, because the mean of its divisors is an integer number (15291493308000).

Almost surely, 2^{616645136660540} is an apocalyptic number.

It is an amenable number.

616645136660540 is an abundant number, since it is smaller than the sum of its proper divisors (851338220907460).

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

616645136660540 is a wasteful number, since it uses less digits than its factorization.

616645136660540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566099 (or 1566097 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 59.

The spelling of 616645136660540 in words is "six hundred sixteen trillion, six hundred forty-five billion, one hundred thirty-six million, six hundred sixty thousand, five hundred forty".