87766666663373 has 2 divisors, whose sum is σ = 87766666663374. Its totient is φ = 87766666663372.

The previous prime is 87766666663279. The next prime is 87766666663441. The reversal of 87766666663373 is 37336666666778.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81176982569929 + 6589684093444 = 9009827^2 + 2567038^2 .

It is a cyclic number.

It is not a de Polignac number, because 87766666663373 - 2²² = 87766662469069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87766666662373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43883333331686 + 43883333331687.

It is an arithmetic number, because the mean of its divisors is an integer number (43883333331687).

Almost surely, 2^{87766666663373} is an apocalyptic number.

It is an amenable number.

87766666663373 is a deficient number, since it is larger than the sum of its proper divisors (1).

87766666663373 is an equidigital number, since it uses as much as digits as its factorization.

87766666663373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20739898368, while the sum is 80.

The spelling of 87766666663373 in words is "eighty-seven trillion, seven hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-three thousand, three hundred seventy-three".