90202988478649 has 2 divisors, whose sum is σ = 90202988478650. Its totient is φ = 90202988478648.

The previous prime is 90202988478641. The next prime is 90202988478709. The reversal of 90202988478649 is 94687488920209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68219455883049 + 21983532595600 = 8259507^2 + 4688660^2 .

It is a cyclic number.

It is not a de Polignac number, because 90202988478649 - 2³ = 90202988478641 is a prime.

It is not a weakly prime, because it can be changed into another prime (90202988478641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45101494239324 + 45101494239325.

It is an arithmetic number, because the mean of its divisors is an integer number (45101494239325).

Almost surely, 2^{90202988478649} is an apocalyptic number.

It is an amenable number.

90202988478649 is a deficient number, since it is larger than the sum of its proper divisors (1).

90202988478649 is an equidigital number, since it uses as much as digits as its factorization.

90202988478649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1003290624, while the sum is 76.

The spelling of 90202988478649 in words is "ninety trillion, two hundred two billion, nine hundred eighty-eight million, four hundred seventy-eight thousand, six hundred forty-nine".