90670221078869 has 2 divisors, whose sum is σ = 90670221078870. Its totient is φ = 90670221078868.

The previous prime is 90670221078809. The next prime is 90670221078881. The reversal of 90670221078869 is 96887012207609.

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., 78876388412644 + 11793832666225 = 8881238^2 + 3434215^2 .

It is a cyclic number.

It is not a de Polignac number, because 90670221078869 - 2³⁶ = 90601501602133 is a prime.

It is a super-2 number, since 2×90670221078869² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90670221078809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45335110539434 + 45335110539435.

It is an arithmetic number, because the mean of its divisors is an integer number (45335110539435).

Almost surely, 2^{90670221078869} is an apocalyptic number.

It is an amenable number.

90670221078869 is a deficient number, since it is larger than the sum of its proper divisors (1).

90670221078869 is an equidigital number, since it uses as much as digits as its factorization.

90670221078869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36578304, while the sum is 65.

The spelling of 90670221078869 in words is "ninety trillion, six hundred seventy billion, two hundred twenty-one million, seventy-eight thousand, eight hundred sixty-nine".