90919561877 has 2 divisors, whose sum is σ = 90919561878. Its totient is φ = 90919561876.

The previous prime is 90919561871. The next prime is 90919561907. The reversal of 90919561877 is 77816591909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51972144676 + 38947417201 = 227974^2 + 197351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90919561877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90919561871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45459780938 + 45459780939.

It is an arithmetic number, because the mean of its divisors is an integer number (45459780939).

Almost surely, 2^90919561877 is an apocalyptic number.

It is an amenable number.

90919561877 is a deficient number, since it is larger than the sum of its proper divisors (1).

90919561877 is an equidigital number, since it uses as much as digits as its factorization.

90919561877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8573040, while the sum is 62.

The spelling of 90919561877 in words is "ninety billion, nine hundred nineteen million, five hundred sixty-one thousand, eight hundred seventy-seven".