642945583 has 4 divisors (see below), whose sum is σ = 734794960. Its totient is φ = 551096208.

The previous prime is 642945581. The next prime is 642945587. The reversal of 642945583 is 385549246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642945583 - 2¹ = 642945581 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 (642945581) 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, 45924678 + ... + 45924691.

It is an arithmetic number, because the mean of its divisors is an integer number (183698740).

Almost surely, 2^642945583 is an apocalyptic number.

642945583 is a deficient number, since it is larger than the sum of its proper divisors (91849377).

642945583 is an equidigital number, since it uses as much as digits as its factorization.

642945583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91849376.

The product of its digits is 1036800, while the sum is 46.

The square root of 642945583 is about 25356.3716450126. The cubic root of 642945583 is about 863.0939500020.

The spelling of 642945583 in words is "six hundred forty-two million, nine hundred forty-five thousand, five hundred eighty-three".