1616155111211 has 4 divisors (see below), whose sum is σ = 1616181727800. Its totient is φ = 1616128494624.

The previous prime is 1616155111201. The next prime is 1616155111217. The reversal of 1616155111211 is 1121115516161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1616155111211 is a prime.

It is a super-2 number, since 2×1616155111211² (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 (1616155111217) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13217006 + ... + 13338723.

It is an arithmetic number, because the mean of its divisors is an integer number (404045431950).

Almost surely, 2^{1616155111211} is an apocalyptic number.

1616155111211 is a deficient number, since it is larger than the sum of its proper divisors (26616589).

1616155111211 is an equidigital number, since it uses as much as digits as its factorization.

1616155111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26616588.

The product of its digits is 1800, while the sum is 32.

The spelling of 1616155111211 in words is "one trillion, six hundred sixteen billion, one hundred fifty-five million, one hundred eleven thousand, two hundred eleven".