1667720853 has 16 divisors (see below), whose sum is σ = 2471538240. Its totient is φ = 1111435632.

The previous prime is 1667720851. The next prime is 1667720863. The reversal of 1667720853 is 3580277661.

It is not a de Polignac number, because 1667720853 - 2¹ = 1667720851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1667720799 and 1667720808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667720851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86650 + ... + 104132.

It is an arithmetic number, because the mean of its divisors is an integer number (154471140).

Almost surely, 2^1667720853 is an apocalyptic number.

It is an amenable number.

1667720853 is a deficient number, since it is larger than the sum of its proper divisors (803817387).

1667720853 is a wasteful number, since it uses less digits than its factorization.

1667720853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21025 (or 21019 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 1667720853 is about 40837.7380984795. The cubic root of 1667720853 is about 1185.8810240318.

The spelling of 1667720853 in words is "one billion, six hundred sixty-seven million, seven hundred twenty thousand, eight hundred fifty-three".