28426291406663 has 4 divisors (see below), whose sum is σ = 29087367951048. Its totient is φ = 27765214862280.

The previous prime is 28426291406627. The next prime is 28426291406741. The reversal of 28426291406663 is 36660419262482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28426291406663 - 2¹² = 28426291402567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28426291406963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330538272128 + ... + 330538272213.

It is an arithmetic number, because the mean of its divisors is an integer number (7271841987762).

Almost surely, 2^{28426291406663} is an apocalyptic number.

28426291406663 is a deficient number, since it is larger than the sum of its proper divisors (661076544385).

28426291406663 is an equidigital number, since it uses as much as digits as its factorization.

28426291406663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661076544384.

The product of its (nonzero) digits is 35831808, while the sum is 59.

The spelling of 28426291406663 in words is "twenty-eight trillion, four hundred twenty-six billion, two hundred ninety-one million, four hundred six thousand, six hundred sixty-three".