642026106215 has 16 divisors (see below), whose sum is σ = 830233121088. Its totient is φ = 473804246016.

The previous prime is 642026106203. The next prime is 642026106263. The reversal of 642026106215 is 512601620246.

It is a cyclic number.

It is not a de Polignac number, because 642026106215 - 2¹⁸ = 642025844071 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 15 ways as a sum of consecutive naturals, for example, 3100394 + ... + 3300983.

It is an arithmetic number, because the mean of its divisors is an integer number (51889570068).

Almost surely, 2^642026106215 is an apocalyptic number.

642026106215 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

642026106215 is a deficient number, since it is larger than the sum of its proper divisors (188207014873).

642026106215 is a wasteful number, since it uses less digits than its factorization.

642026106215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6402938.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 642026106215 in words is "six hundred forty-two billion, twenty-six million, one hundred six thousand, two hundred fifteen".