90816605513 has 2 divisors, whose sum is σ = 90816605514. Its totient is φ = 90816605512.

The previous prime is 90816605501. The next prime is 90816605647. The reversal of 90816605513 is 31550661809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59559426304 + 31257179209 = 244048^2 + 176797^2 .

It is an emirp because it is prime and its reverse (31550661809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90816605513 - 2¹⁶ = 90816539977 is a prime.

It is not a weakly prime, because it can be changed into another prime (90816305513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45408302756 + 45408302757.

It is an arithmetic number, because the mean of its divisors is an integer number (45408302757).

Almost surely, 2^90816605513 is an apocalyptic number.

It is an amenable number.

90816605513 is a deficient number, since it is larger than the sum of its proper divisors (1).

90816605513 is an equidigital number, since it uses as much as digits as its factorization.

90816605513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 90816605513 in words is "ninety billion, eight hundred sixteen million, six hundred five thousand, five hundred thirteen".