20664666242015 has 8 divisors (see below), whose sum is σ = 24798016844880. Its totient is φ = 16531454757312.

The previous prime is 20664666241997. The next prime is 20664666242023. The reversal of 20664666242015 is 51024266646602.

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 20664666242015 - 2²⁴ = 20664649464799 is a prime.

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, 34452470 + ... + 35047139.

It is an arithmetic number, because the mean of its divisors is an integer number (3099752105610).

Almost surely, 2^{20664666242015} is an apocalyptic number.

20664666242015 is a deficient number, since it is larger than the sum of its proper divisors (4133350602865).

20664666242015 is an equidigital number, since it uses as much as digits as its factorization.

20664666242015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69559081.

The product of its (nonzero) digits is 4976640, while the sum is 50.

The spelling of 20664666242015 in words is "twenty trillion, six hundred sixty-four billion, six hundred sixty-six million, two hundred forty-two thousand, fifteen".