642417653 has 4 divisors (see below), whose sum is σ = 642721248. Its totient is φ = 642114060.

The previous prime is 642417649. The next prime is 642417673. The reversal of 642417653 is 356714246.

It is a happy number.

642417653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642417653 - 2² = 642417649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642417673) 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, 148601 + ... + 152862.

It is an arithmetic number, because the mean of its divisors is an integer number (160680312).

Almost surely, 2^642417653 is an apocalyptic number.

It is an amenable number.

642417653 is a deficient number, since it is larger than the sum of its proper divisors (303595).

642417653 is a wasteful number, since it uses less digits than its factorization.

642417653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303594.

The product of its digits is 120960, while the sum is 38.

The square root of 642417653 is about 25345.9593032104. The cubic root of 642417653 is about 862.8576531976.

The spelling of 642417653 in words is "six hundred forty-two million, four hundred seventeen thousand, six hundred fifty-three".