642253543 has 4 divisors (see below), whose sum is σ = 655918560. Its totient is φ = 628588528.

The previous prime is 642253519. The next prime is 642253553. The reversal of 642253543 is 345352246.

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

It is not a de Polignac number, because 642253543 - 2²⁵ = 608699111 is a prime.

It is a super-2 number, since 2×642253543² = 824979226992105698, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642253499 and 642253508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642253553) 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, 6832438 + ... + 6832531.

It is an arithmetic number, because the mean of its divisors is an integer number (163979640).

Almost surely, 2^642253543 is an apocalyptic number.

642253543 is a deficient number, since it is larger than the sum of its proper divisors (13665017).

642253543 is a wasteful number, since it uses less digits than its factorization.

642253543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13665016.

The product of its digits is 86400, while the sum is 34.

The square root of 642253543 is about 25342.7216967712. The cubic root of 642253543 is about 862.7841726364.

The spelling of 642253543 in words is "six hundred forty-two million, two hundred fifty-three thousand, five hundred forty-three".