1667604642 has 16 divisors (see below), whose sum is σ = 3638410272. Its totient is φ = 505334720.

The previous prime is 1667604623. The next prime is 1667604643. The reversal of 1667604642 is 2464067661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1667604594 and 1667604603.

It is not an unprimeable number, because it can be changed into a prime (1667604643) 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, 12633303 + ... + 12633434.

It is an arithmetic number, because the mean of its divisors is an integer number (227400642).

Almost surely, 2^1667604642 is an apocalyptic number.

1667604642 is an abundant number, since it is smaller than the sum of its proper divisors (1970805630).

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

1667604642 is a wasteful number, since it uses less digits than its factorization.

1667604642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25266753.

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 1667604642 is about 40836.3152353392. The cubic root of 1667604642 is about 1185.8534783306.

The spelling of 1667604642 in words is "one billion, six hundred sixty-seven million, six hundred four thousand, six hundred forty-two".