642426144106415 has 4 divisors (see below), whose sum is σ = 770911372927704. Its totient is φ = 513940915285128.

The previous prime is 642426144106387. The next prime is 642426144106511. The reversal of 642426144106415 is 514601441624246.

642426144106415 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642426144106415 is a prime.

It is a super-2 number, since 2×642426144106415² (a number of 30 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 64242614410637 + ... + 64242614410646.

It is an arithmetic number, because the mean of its divisors is an integer number (192727843231926).

Almost surely, 2^{642426144106415} is an apocalyptic number.

642426144106415 is a deficient number, since it is larger than the sum of its proper divisors (128485228821289).

642426144106415 is a wasteful number, since it uses less digits than its factorization.

642426144106415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128485228821288.

The product of its (nonzero) digits is 4423680, while the sum is 50.

The spelling of 642426144106415 in words is "six hundred forty-two trillion, four hundred twenty-six billion, one hundred forty-four million, one hundred six thousand, four hundred fifteen".