1616647667 has 4 divisors (see below), whose sum is σ = 1686936720. Its totient is φ = 1546358616.

The previous prime is 1616647649. The next prime is 1616647729. The reversal of 1616647667 is 7667466161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7667466161 = 313 ⋅24496697.

It is a cyclic number.

It is not a de Polignac number, because 1616647667 - 2⁸ = 1616647411 is a prime.

It is a super-2 number, since 2×1616647667² = 5227099358433085778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616647267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35144492 + ... + 35144537.

It is an arithmetic number, because the mean of its divisors is an integer number (421734180).

Almost surely, 2^1616647667 is an apocalyptic number.

1616647667 is a deficient number, since it is larger than the sum of its proper divisors (70289053).

1616647667 is an equidigital number, since it uses as much as digits as its factorization.

1616647667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70289052.

The product of its digits is 1524096, while the sum is 50.

The square root of 1616647667 is about 40207.5573368987. The cubic root of 1616647667 is about 1173.6496131505.

The spelling of 1616647667 in words is "one billion, six hundred sixteen million, six hundred forty-seven thousand, six hundred sixty-seven".