1667618880 has 56 divisors (see below), whose sum is σ = 5294692992. Its totient is φ = 444698112.

The previous prime is 1667618879. The next prime is 1667618881. The reversal of 1667618880 is 888167661.

It is an interprime number because it is at equal distance from previous prime (1667618879) and next prime (1667618881).

It is not an unprimeable number, because it can be changed into a prime (1667618881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867592 + ... + 869511.

Almost surely, 2^1667618880 is an apocalyptic number.

1667618880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1667618880 is an abundant number, since it is smaller than the sum of its proper divisors (3627074112).

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

1667618880 is a wasteful number, since it uses less digits than its factorization.

1667618880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737123 (or 1737113 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 1667618880 is about 40836.4895650936. The cubic root of 1667618880 is about 1185.8568532580.

The spelling of 1667618880 in words is "one billion, six hundred sixty-seven million, six hundred eighteen thousand, eight hundred eighty".