90504866239517 has 2 divisors, whose sum is σ = 90504866239518. Its totient is φ = 90504866239516.

The previous prime is 90504866239393. The next prime is 90504866239589. The reversal of 90504866239517 is 71593266840509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88292727609241 + 2212138630276 = 9396421^2 + 1487326^2 .

It is a cyclic number.

It is not a de Polignac number, because 90504866239517 - 2¹⁴ = 90504866223133 is a prime.

It is a super-2 number, since 2×90504866239517² (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 (90504866239217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45252433119758 + 45252433119759.

It is an arithmetic number, because the mean of its divisors is an integer number (45252433119759).

It is a 1-persistent number, because it is pandigital, but 2⋅90504866239517 = 181009732479034 is not.

Almost surely, 2^{90504866239517} is an apocalyptic number.

It is an amenable number.

90504866239517 is a deficient number, since it is larger than the sum of its proper divisors (1).

90504866239517 is an equidigital number, since it uses as much as digits as its factorization.

90504866239517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97977600, while the sum is 65.

The spelling of 90504866239517 in words is "ninety trillion, five hundred four billion, eight hundred sixty-six million, two hundred thirty-nine thousand, five hundred seventeen".