642513602281 has 8 divisors (see below), whose sum is σ = 645100047360. Its totient is φ = 639931891632.

The previous prime is 642513602221. The next prime is 642513602287. The reversal of 642513602281 is 182206315246.

642513602281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642513602281 - 2¹¹ = 642513600233 is a prime.

It is a super-2 number, since 2×642513602281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642513602287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 911515 + ... + 1454608.

It is an arithmetic number, because the mean of its divisors is an integer number (80637505920).

Almost surely, 2^642513602281 is an apocalyptic number.

It is an amenable number.

642513602281 is a deficient number, since it is larger than the sum of its proper divisors (2586445079).

642513602281 is a wasteful number, since it uses less digits than its factorization.

642513602281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367215.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 642513602281 in words is "six hundred forty-two billion, five hundred thirteen million, six hundred two thousand, two hundred eighty-one".