90165393547 has 4 divisors (see below), whose sum is σ = 90559129120. Its totient is φ = 89771657976.

The previous prime is 90165393517. The next prime is 90165393559. The reversal of 90165393547 is 74539356109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74539356109 = 47 ⋅1585943747.

It is a cyclic number.

It is not a de Polignac number, because 90165393547 - 2¹⁹ = 90164869259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90165393494 and 90165393503.

It is not an unprimeable number, because it can be changed into a prime (90165393517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196867443 + ... + 196867900.

It is an arithmetic number, because the mean of its divisors is an integer number (22639782280).

Almost surely, 2^90165393547 is an apocalyptic number.

90165393547 is a deficient number, since it is larger than the sum of its proper divisors (393735573).

90165393547 is a wasteful number, since it uses less digits than its factorization.

90165393547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393735572.

The product of its (nonzero) digits is 3061800, while the sum is 52.

The spelling of 90165393547 in words is "ninety billion, one hundred sixty-five million, three hundred ninety-three thousand, five hundred forty-seven".