90816605647 has 2 divisors, whose sum is σ = 90816605648. Its totient is φ = 90816605646.

The previous prime is 90816605513. The next prime is 90816605651. The reversal of 90816605647 is 74650661809.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90816605647 - 2²³ = 90808217039 is a prime.

It is a super-2 number, since 2×90816605647² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90816605594 and 90816605603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90816605657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45408302823 + 45408302824.

It is an arithmetic number, because the mean of its divisors is an integer number (45408302824).

Almost surely, 2^90816605647 is an apocalyptic number.

90816605647 is a deficient number, since it is larger than the sum of its proper divisors (1).

90816605647 is an equidigital number, since it uses as much as digits as its factorization.

90816605647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 90816605647 in words is "ninety billion, eight hundred sixteen million, six hundred five thousand, six hundred forty-seven".