1766340421 has 2 divisors, whose sum is σ = 1766340422. Its totient is φ = 1766340420.

The previous prime is 1766340397. The next prime is 1766340431. The reversal of 1766340421 is 1240436671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1237984225 + 528356196 = 35185^2 + 22986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1766340421 - 2⁷ = 1766340293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1766340431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 883170210 + 883170211.

It is an arithmetic number, because the mean of its divisors is an integer number (883170211).

Almost surely, 2^1766340421 is an apocalyptic number.

It is an amenable number.

1766340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1766340421 is an equidigital number, since it uses as much as digits as its factorization.

1766340421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 1766340421 is about 42027.8529192249. The cubic root of 1766340421 is about 1208.8102553211.

The spelling of 1766340421 in words is "one billion, seven hundred sixty-six million, three hundred forty thousand, four hundred twenty-one".