90778815329 has 2 divisors, whose sum is σ = 90778815330. Its totient is φ = 90778815328.

The previous prime is 90778815269. The next prime is 90778815341. The reversal of 90778815329 is 92351887709.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74817019729 + 15961795600 = 273527^2 + 126340^2 .

It is a cyclic number.

It is not a de Polignac number, because 90778815329 - 2²⁰ = 90777766753 is a prime.

It is not a weakly prime, because it can be changed into another prime (90778815629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45389407664 + 45389407665.

It is an arithmetic number, because the mean of its divisors is an integer number (45389407665).

Almost surely, 2^90778815329 is an apocalyptic number.

It is an amenable number.

90778815329 is a deficient number, since it is larger than the sum of its proper divisors (1).

90778815329 is an equidigital number, since it uses as much as digits as its factorization.

90778815329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 90778815329 in words is "ninety billion, seven hundred seventy-eight million, eight hundred fifteen thousand, three hundred twenty-nine".