642066874 has 4 divisors (see below), whose sum is σ = 963100314. Its totient is φ = 321033436.

The previous prime is 642066839. The next prime is 642066899. The reversal of 642066874 is 478660246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 478660246 = 2 ⋅239330123.

It can be written as a sum of positive squares in only one way, i.e., 429111225 + 212955649 = 20715^2 + 14593^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642066874.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160516717 + ... + 160516720.

Almost surely, 2^642066874 is an apocalyptic number.

642066874 is a deficient number, since it is larger than the sum of its proper divisors (321033440).

642066874 is a wasteful number, since it uses less digits than its factorization.

642066874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321033439.

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 642066874 is about 25339.0385374031. The cubic root of 642066874 is about 862.7005760224.

The spelling of 642066874 in words is "six hundred forty-two million, sixty-six thousand, eight hundred seventy-four".