1667389056 has 64 divisors (see below), whose sum is σ = 4439080800. Its totient is φ = 554531840.

The previous prime is 1667389037. The next prime is 1667389057. The reversal of 1667389056 is 6509837661.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1667389056² = 5560372528137142272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1667389057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172315 + ... + 181733.

Almost surely, 2^1667389056 is an apocalyptic number.

1667389056 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 1667389056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2219540400).

1667389056 is an abundant number, since it is smaller than the sum of its proper divisors (2771691744).

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

1667389056 is an equidigital number, since it uses as much as digits as its factorization.

1667389056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9897 (or 9885 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 1667389056 is about 40833.6755142125. The cubic root of 1667389056 is about 1185.8023742062.

The spelling of 1667389056 in words is "one billion, six hundred sixty-seven million, three hundred eighty-nine thousand, fifty-six".