1667997696 has 112 divisors (see below), whose sum is σ = 4518562464. Its totient is φ = 547160064.

The previous prime is 1667997691. The next prime is 1667997701. The reversal of 1667997696 is 6967997661.

It is an interprime number because it is at equal distance from previous prime (1667997691) and next prime (1667997701).

It is a super-2 number, since 2×1667997696² = 5564432627722616832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1667997691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646086 + ... + 1647098.

Almost surely, 2^1667997696 is an apocalyptic number.

1667997696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1667997696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2259281232).

1667997696 is an abundant number, since it is smaller than the sum of its proper divisors (2850564768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1667997696 is an equidigital number, since it uses as much as digits as its factorization.

1667997696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109 (or 1085 counting only the distinct ones).

The product of its digits is 46294416, while the sum is 66.

The square root of 1667997696 is about 40841.1275064732. The cubic root of 1667997696 is about 1185.9466394685.

The spelling of 1667997696 in words is "one billion, six hundred sixty-seven million, nine hundred ninety-seven thousand, six hundred ninety-six".