1667400005 has 32 divisors (see below), whose sum is σ = 2171836800. Its totient is φ = 1224605952.

The previous prime is 1667399999. The next prime is 1667400023. The reversal of 1667400005 is 5000047661.

It is a cyclic number.

It is not a de Polignac number, because 1667400005 - 2⁶ = 1667399941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1029086 + ... + 1030704.

It is an arithmetic number, because the mean of its divisors is an integer number (67869900).

Almost surely, 2^1667400005 is an apocalyptic number.

It is an amenable number.

1667400005 is a deficient number, since it is larger than the sum of its proper divisors (504436795).

1667400005 is a wasteful number, since it uses less digits than its factorization.

1667400005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1667400005 is about 40833.8095822567. The cubic root of 1667400005 is about 1185.8049697455.

Adding to 1667400005 its reverse (5000047661), we get a palindrome (6667447666).

The spelling of 1667400005 in words is "one billion, six hundred sixty-seven million, four hundred thousand, five".