642658066 has 8 divisors (see below), whose sum is σ = 966225024. Its totient is φ = 320583060.

The previous prime is 642658061. The next prime is 642658099. The reversal of 642658066 is 660856246.

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

It is not an unprimeable number, because it can be changed into a prime (642658061) 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, 371910 + ... + 373633.

It is an arithmetic number, because the mean of its divisors is an integer number (120778128).

Almost surely, 2^642658066 is an apocalyptic number.

642658066 is a deficient number, since it is larger than the sum of its proper divisors (323566958).

642658066 is a wasteful number, since it uses less digits than its factorization.

642658066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745976.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 642658066 is about 25350.7014893079. The cubic root of 642658066 is about 862.9652759797.

The spelling of 642658066 in words is "six hundred forty-two million, six hundred fifty-eight thousand, sixty-six".