642566355 has 8 divisors (see below), whose sum is σ = 1028106192. Its totient is φ = 342702048.

The previous prime is 642566347. The next prime is 642566359. The reversal of 642566355 is 553665246.

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

It is not a de Polignac number, because 642566355 - 2³ = 642566347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642566359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21418864 + ... + 21418893.

It is an arithmetic number, because the mean of its divisors is an integer number (128513274).

Almost surely, 2^642566355 is an apocalyptic number.

642566355 is a deficient number, since it is larger than the sum of its proper divisors (385539837).

642566355 is a wasteful number, since it uses less digits than its factorization.

642566355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42837765.

The product of its digits is 648000, while the sum is 42.

The square root of 642566355 is about 25348.8925793613. The cubic root of 642566355 is about 862.9242239918.

The spelling of 642566355 in words is "six hundred forty-two million, five hundred sixty-six thousand, three hundred fifty-five".