28345031020661 has 2 divisors, whose sum is σ = 28345031020662. Its totient is φ = 28345031020660.

The previous prime is 28345031020627. The next prime is 28345031020711. The reversal of 28345031020661 is 16602013054382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27041757628561 + 1303273392100 = 5200169^2 + 1141610^2 .

It is a cyclic number.

It is not a de Polignac number, because 28345031020661 - 2³⁰ = 28343957278837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28345031028661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172515510330 + 14172515510331.

It is an arithmetic number, because the mean of its divisors is an integer number (14172515510331).

Almost surely, 2^{28345031020661} is an apocalyptic number.

It is an amenable number.

28345031020661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28345031020661 is an equidigital number, since it uses as much as digits as its factorization.

28345031020661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 28345031020661 in words is "twenty-eight trillion, three hundred forty-five billion, thirty-one million, twenty thousand, six hundred sixty-one".