1656216111 has 16 divisors (see below), whose sum is σ = 2535834240. Its totient is φ = 950937120.

The previous prime is 1656216091. The next prime is 1656216161. The reversal of 1656216111 is 1116126561.

It is not a de Polignac number, because 1656216111 - 2⁶ = 1656216047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656216161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1320120 + ... + 1321373.

It is an arithmetic number, because the mean of its divisors is an integer number (158489640).

Almost surely, 2^1656216111 is an apocalyptic number.

1656216111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1656216111 is a deficient number, since it is larger than the sum of its proper divisors (879618129).

1656216111 is a wasteful number, since it uses less digits than its factorization.

1656216111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641526.

The product of its digits is 2160, while the sum is 30.

The square root of 1656216111 is about 40696.6351311752. The cubic root of 1656216111 is about 1183.1478031067.

The spelling of 1656216111 in words is "one billion, six hundred fifty-six million, two hundred sixteen thousand, one hundred eleven".