642532801061 has 4 divisors (see below), whose sum is σ = 642534408300. Its totient is φ = 642531193824.

The previous prime is 642532801039. The next prime is 642532801087. The reversal of 642532801061 is 160108235246.

642532801061 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 557971650625 + 84561150436 = 746975^2 + 290794^2 .

It is a cyclic number.

It is not a de Polignac number, because 642532801061 - 2²² = 642528606757 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 (642534801061) 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, 316025 + ... + 1176833.

It is an arithmetic number, because the mean of its divisors is an integer number (160633602075).

Almost surely, 2^642532801061 is an apocalyptic number.

It is an amenable number.

642532801061 is a deficient number, since it is larger than the sum of its proper divisors (1607239).

642532801061 is an equidigital number, since it uses as much as digits as its factorization.

642532801061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607238.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 642532801061 in words is "six hundred forty-two billion, five hundred thirty-two million, eight hundred one thousand, sixty-one".