642506111405 has 8 divisors (see below), whose sum is σ = 771074969184. Its totient is φ = 513959798800.

The previous prime is 642506111389. The next prime is 642506111491. The reversal of 642506111405 is 504111605246.

642506111405 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 not a de Polignac number, because 642506111405 - 2⁴ = 642506111389 is a prime.

It is a Duffinian number.

It is a congruent 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, 5573531 + ... + 5687640.

It is an arithmetic number, because the mean of its divisors is an integer number (96384371148).

Almost surely, 2^642506111405 is an apocalyptic number.

It is an amenable number.

642506111405 is a deficient number, since it is larger than the sum of its proper divisors (128568857779).

642506111405 is a wasteful number, since it uses less digits than its factorization.

642506111405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11272587.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 642506111405 in words is "six hundred forty-two billion, five hundred six million, one hundred eleven thousand, four hundred five".