99880892818561 has 4 divisors (see below), whose sum is σ = 99884616826324. Its totient is φ = 99877168810800.

The previous prime is 99880892818559. The next prime is 99880892818583. The reversal of 99880892818561 is 16581829808899.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33420897528561 + 66459995290000 = 5781081^2 + 8152300^2 .

It is a cyclic number.

It is not a de Polignac number, because 99880892818561 - 2¹ = 99880892818559 is a prime.

It is a super-3 number, since 3×99880892818561³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99880892818501) 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, 1861963650 + ... + 1862017291.

It is an arithmetic number, because the mean of its divisors is an integer number (24971154206581).

Almost surely, 2^{99880892818561} is an apocalyptic number.

It is an amenable number.

99880892818561 is a deficient number, since it is larger than the sum of its proper divisors (3724007763).

99880892818561 is a wasteful number, since it uses less digits than its factorization.

99880892818561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724007762.

The product of its (nonzero) digits is 1433272320, while the sum is 82.

The spelling of 99880892818561 in words is "ninety-nine trillion, eight hundred eighty billion, eight hundred ninety-two million, eight hundred eighteen thousand, five hundred sixty-one".