1616016556561 has 8 divisors (see below), whose sum is σ = 1763067340800. Its totient is φ = 1468989137040.

The previous prime is 1616016556529. The next prime is 1616016556579. The reversal of 1616016556561 is 1656556106161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1616016556561 - 2⁵ = 1616016556529 is a prime.

It is a super-2 number, since 2×1616016556561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616013556561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5696401 + ... + 5973358.

It is an arithmetic number, because the mean of its divisors is an integer number (220383417600).

Almost surely, 2^{1616016556561} is an apocalyptic number.

1616016556561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1616016556561 is a deficient number, since it is larger than the sum of its proper divisors (147050784239).

1616016556561 is a wasteful number, since it uses less digits than its factorization.

1616016556561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11682359.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 1616016556561 in words is "one trillion, six hundred sixteen billion, sixteen million, five hundred fifty-six thousand, five hundred sixty-one".