642155530241 has 4 divisors (see below), whose sum is σ = 646245693012. Its totient is φ = 638065367472.

The previous prime is 642155530231. The next prime is 642155530267. The reversal of 642155530241 is 142035551246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142035551246 = 2 ⋅71017775623.

It can be written as a sum of positive squares in 2 ways, for example, as 136158048016 + 505997482225 = 368996^2 + 711335^2 .

It is a cyclic number.

It is not a de Polignac number, because 642155530241 - 2²² = 642151335937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642155530195 and 642155530204.

It is not an unprimeable number, because it can be changed into a prime (642155530231) 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, 2045081150 + ... + 2045081463.

It is an arithmetic number, because the mean of its divisors is an integer number (161561423253).

Almost surely, 2^642155530241 is an apocalyptic number.

It is an amenable number.

642155530241 is a deficient number, since it is larger than the sum of its proper divisors (4090162771).

642155530241 is a wasteful number, since it uses less digits than its factorization.

642155530241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090162770.

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 642155530241 in words is "six hundred forty-two billion, one hundred fifty-five million, five hundred thirty thousand, two hundred forty-one".