90021746669 has 8 divisors (see below), whose sum is σ = 93129390360. Its totient is φ = 86914332736.

The previous prime is 90021746663. The next prime is 90021746707. The reversal of 90021746669 is 96664712009.

It can be written as a sum of positive squares in 4 ways, for example, as 42745444 + 89979001225 = 6538^2 + 299965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90021746669 - 2²⁰ = 90020698093 is a prime.

It is a super-2 number, since 2×90021746669² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90021746663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226327 + ... + 1297659.

It is an arithmetic number, because the mean of its divisors is an integer number (11641173795).

Almost surely, 2^90021746669 is an apocalyptic number.

It is an amenable number.

90021746669 is a deficient number, since it is larger than the sum of its proper divisors (3107643691).

90021746669 is a wasteful number, since it uses less digits than its factorization.

90021746669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114879.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 90021746669 in words is "ninety billion, twenty-one million, seven hundred forty-six thousand, six hundred sixty-nine".