616665540 has 48 divisors (see below), whose sum is σ = 1727998272. Its totient is φ = 164317056.

The previous prime is 616665527. The next prime is 616665551. The reversal of 616665540 is 45566616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94462 + ... + 100778.

It is an arithmetic number, because the mean of its divisors is an integer number (35999964).

Almost surely, 2^616665540 is an apocalyptic number.

616665540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

616665540 is an abundant number, since it is smaller than the sum of its proper divisors (1111332732).

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

616665540 is a wasteful number, since it uses less digits than its factorization.

616665540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7956 (or 7954 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 616665540 is about 24832.7513578339. The cubic root of 616665540 is about 851.1704935436.

The spelling of 616665540 in words is "six hundred sixteen million, six hundred sixty-five thousand, five hundred forty".