1616537226561 has 16 divisors (see below), whose sum is σ = 2163685141440. Its totient is φ = 1073541471680.

The previous prime is 1616537226517. The next prime is 1616537226569. The reversal of 1616537226561 is 1656227356161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1616537226561 - 2⁹ = 1616537226049 is a prime.

It is a super-2 number, since 2×1616537226561² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1616537226569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6076411 + ... + 6336863.

It is an arithmetic number, because the mean of its divisors is an integer number (135230321340).

Almost surely, 2^{1616537226561} is an apocalyptic number.

It is an amenable number.

1616537226561 is a deficient number, since it is larger than the sum of its proper divisors (547147914879).

1616537226561 is a wasteful number, since it uses less digits than its factorization.

1616537226561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268416.

The product of its digits is 2721600, while the sum is 51.

The spelling of 1616537226561 in words is "one trillion, six hundred sixteen billion, five hundred thirty-seven million, two hundred twenty-six thousand, five hundred sixty-one".