90821718299 has 4 divisors (see below), whose sum is σ = 97808004336. Its totient is φ = 83835432264.

The previous prime is 90821718293. The next prime is 90821718343. The reversal of 90821718299 is 99281712809.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90821718299 - 2²⁸ = 90553282843 is a prime.

It is a super-2 number, since 2×90821718299² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90821718293) 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, 3493142999 + ... + 3493143024.

It is an arithmetic number, because the mean of its divisors is an integer number (24452001084).

Almost surely, 2^90821718299 is an apocalyptic number.

90821718299 is a deficient number, since it is larger than the sum of its proper divisors (6986286037).

90821718299 is a wasteful number, since it uses less digits than its factorization.

90821718299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6986286036.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The spelling of 90821718299 in words is "ninety billion, eight hundred twenty-one million, seven hundred eighteen thousand, two hundred ninety-nine".