66280000693 has 2 divisors, whose sum is σ = 66280000694. Its totient is φ = 66280000692.

The previous prime is 66280000667. The next prime is 66280000723. The reversal of 66280000693 is 39600008266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55838635204 + 10441365489 = 236302^2 + 102183^2 .

It is a cyclic number.

It is not a de Polignac number, because 66280000693 - 2²⁵ = 66246446261 is a prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33140000346 + 33140000347.

It is an arithmetic number, because the mean of its divisors is an integer number (33140000347).

Almost surely, 2^66280000693 is an apocalyptic number.

It is an amenable number.

66280000693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66280000693 is an equidigital number, since it uses as much as digits as its factorization.

66280000693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 66280000693 in words is "sixty-six billion, two hundred eighty million, six hundred ninety-three", and thus it is an aban number.