642662565 has 8 divisors (see below), whose sum is σ = 1028260128. Its totient is φ = 342753360.

The previous prime is 642662561. The next prime is 642662567. The reversal of 642662565 is 565266246.

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

It is not a de Polignac number, because 642662565 - 2² = 642662561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642662561) 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, 21422071 + ... + 21422100.

It is an arithmetic number, because the mean of its divisors is an integer number (128532516).

Almost surely, 2^642662565 is an apocalyptic number.

It is an amenable number.

642662565 is a deficient number, since it is larger than the sum of its proper divisors (385597563).

642662565 is a wasteful number, since it uses less digits than its factorization.

642662565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42844179.

The product of its digits is 518400, while the sum is 42.

The square root of 642662565 is about 25350.7902243697. The cubic root of 642662565 is about 862.9672897368.

The spelling of 642662565 in words is "six hundred forty-two million, six hundred sixty-two thousand, five hundred sixty-five".