28382851330661 has 4 divisors (see below), whose sum is σ = 28383198607500. Its totient is φ = 28382504053824.

The previous prime is 28382851330657. The next prime is 28382851330679. The reversal of 28382851330661 is 16603315828382.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16379779273636 + 12003072057025 = 4047194^2 + 3464545^2 .

It is a cyclic number.

It is not a de Polignac number, because 28382851330661 - 2² = 28382851330657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28382851330597 and 28382851330606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28382851330651) 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, 173515796 + ... + 173679293.

It is an arithmetic number, because the mean of its divisors is an integer number (7095799651875).

Almost surely, 2^{28382851330661} is an apocalyptic number.

It is an amenable number.

28382851330661 is a deficient number, since it is larger than the sum of its proper divisors (347276839).

28382851330661 is an equidigital number, since it uses as much as digits as its factorization.

28382851330661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347276838.

The product of its (nonzero) digits is 9953280, while the sum is 56.

The spelling of 28382851330661 in words is "twenty-eight trillion, three hundred eighty-two billion, eight hundred fifty-one million, three hundred thirty thousand, six hundred sixty-one".