642605143 has 4 divisors (see below), whose sum is σ = 642739888. Its totient is φ = 642470400.

The previous prime is 642605111. The next prime is 642605147. The reversal of 642605143 is 341506246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341506246 = 2 ⋅170753123.

It is a cyclic number.

It is not a de Polignac number, because 642605143 - 2⁵ = 642605111 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 (642605147) 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, 59946 + ... + 69847.

It is an arithmetic number, because the mean of its divisors is an integer number (160684972).

Almost surely, 2^642605143 is an apocalyptic number.

642605143 is a deficient number, since it is larger than the sum of its proper divisors (134745).

642605143 is a wasteful number, since it uses less digits than its factorization.

642605143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134744.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 642605143 is about 25349.6576505483. The cubic root of 642605143 is about 862.9415868841.

The spelling of 642605143 in words is "six hundred forty-two million, six hundred five thousand, one hundred forty-three".