90420902361169 has 2 divisors, whose sum is σ = 90420902361170. Its totient is φ = 90420902361168.

The previous prime is 90420902361157. The next prime is 90420902361191. The reversal of 90420902361169 is 96116320902409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85587236287569 + 4833666073600 = 9251337^2 + 2198560^2 .

It is a cyclic number.

It is not a de Polignac number, because 90420902361169 - 2¹¹ = 90420902359121 is a prime.

It is a super-2 number, since 2×90420902361169² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90420902661169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45210451180584 + 45210451180585.

It is an arithmetic number, because the mean of its divisors is an integer number (45210451180585).

Almost surely, 2^{90420902361169} is an apocalyptic number.

It is an amenable number.

90420902361169 is a deficient number, since it is larger than the sum of its proper divisors (1).

90420902361169 is an equidigital number, since it uses as much as digits as its factorization.

90420902361169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 90420902361169 in words is "ninety trillion, four hundred twenty billion, nine hundred two million, three hundred sixty-one thousand, one hundred sixty-nine".