664116642 has 24 divisors (see below), whose sum is σ = 1644479616. Its totient is φ = 189747576.

The previous prime is 664116631. The next prime is 664116653. The reversal of 664116642 is 246611466.

664116642 is a `hidden beast` number, since 6 + 6 + 4 + 1 + 1 + 6 + 642 = 666.

It is an interprime number because it is at equal distance from previous prime (664116631) and next prime (664116653).

It is a junction number, because it is equal to n+sod(n) for n = 664116597 and 664116606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2635258 + ... + 2635509.

It is an arithmetic number, because the mean of its divisors is an integer number (68519984).

Almost surely, 2^664116642 is an apocalyptic number.

664116642 is an abundant number, since it is smaller than the sum of its proper divisors (980362974).

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

664116642 is a wasteful number, since it uses less digits than its factorization.

664116642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270782 (or 5270779 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 664116642 is about 25770.4606478037. The cubic root of 664116642 is about 872.4652157023.

The spelling of 664116642 in words is "six hundred sixty-four million, one hundred sixteen thousand, six hundred forty-two".