642510566 has 8 divisors (see below), whose sum is σ = 1005668784. Its totient is φ = 307287640.

The previous prime is 642510551. The next prime is 642510569. The reversal of 642510566 is 665015246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642510569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6983765 + ... + 6983856.

It is an arithmetic number, because the mean of its divisors is an integer number (125708598).

Almost surely, 2^642510566 is an apocalyptic number.

642510566 is a deficient number, since it is larger than the sum of its proper divisors (363158218).

642510566 is a wasteful number, since it uses less digits than its factorization.

642510566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13967646.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 642510566 is about 25347.7921326493. The cubic root of 642510566 is about 862.8992496201.

The spelling of 642510566 in words is "six hundred forty-two million, five hundred ten thousand, five hundred sixty-six".