642684374345 has 8 divisors (see below), whose sum is σ = 830545960776. Its totient is φ = 474597691776.

The previous prime is 642684374317. The next prime is 642684374351. The reversal of 642684374345 is 543473486246.

642684374345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15922401856 + 626761972489 = 126184^2 + 791683^2 .

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

It is not a de Polignac number, because 642684374345 - 2¹⁰ = 642684373321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4943725892 + ... + 4943726021.

It is an arithmetic number, because the mean of its divisors is an integer number (103818245097).

Almost surely, 2^642684374345 is an apocalyptic number.

642684374345 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

642684374345 is a deficient number, since it is larger than the sum of its proper divisors (187861586431).

642684374345 is a wasteful number, since it uses less digits than its factorization.

642684374345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9887451931.

The product of its digits is 46448640, while the sum is 56.

The spelling of 642684374345 in words is "six hundred forty-two billion, six hundred eighty-four million, three hundred seventy-four thousand, three hundred forty-five".